{"id":57775,"date":"2025-08-28T17:57:58","date_gmt":"2025-08-28T12:27:58","guid":{"rendered":"https:\/\/e-gmat.com\/blogs\/?p=57775"},"modified":"2025-09-04T19:38:00","modified_gmt":"2025-09-04T14:08:00","slug":"conodonts-the-spiky-phosphatic-remains-bones-and-teeth-composed-of","status":"publish","type":"post","link":"https:\/\/e-gmat.com\/blogs\/conodonts-the-spiky-phosphatic-remains-bones-and-teeth-composed-of\/","title":{"rendered":"Conodonts, the spiky phosphatic remains (bones and teeth composed of calcium….."},"content":{"rendered":"A <\/span> 6<\/span> min read <\/span><\/span>\n

Conodonts, the spiky phosphatic remains (bones and teeth composed of calcium phosphate) of tiny marine animals that probably appeared about 520 million years ago, were once among the most controversial of fossils. Both the nature of the organism to which the remains belonged and the function of the remains were unknown. However, since the 1981 discovery of fossils preserving not just the phosphatic elements but also other remains of the tiny soft-bodied animals (also called conodonts) that bore them, scientists’ reconstructions of the animals’ anatomy have had important implications for hypotheses concerning the development of the vertebrate skeleton.<\/p>\n\n\n\n

The vertebrate skeleton had traditionally been regarded as a defensive development, champions of this view postulating that it was only with the much later evolution of jaws that vertebrates became predators. The first vertebrates, which were soft bodied, would have been easy prey for numerous invertebrate carnivores, especially if these early vertebrates were sedentary suspension feeders. Thus, traditionalists argued, these animals developed coverings of bony scales or plates, and teeth were secondary features, adapted from the protective bony scales. Indeed, external skeletons of this type are common among the well-known fossils of ostracoderm, jawless vertebrates that existed from approximately 500 to 400 million years ago. However, other paleontologists argued that many of the definitive characteristics of vertebrates, such as paired eyes and muscular and skeletal adaptations for active life, would not have evolved unless the first vertebrates were predatory. Teeth were more primitive than external armor according to this view, and the earliest vertebrates were predators.<\/p>\n\n\n\n

The stiffening notochord along the back of the body, V-shaped muscle blocks along the sides, and posterior tail fins help to identify conodonts as among the most primitive of vertebrates. The lack of any mineralized structures apart from the elements in the mouth indicates that conodonts were more primitive than the armored jawless fishes such as the ostracoderms. It now appears that the hard parts that first evolved in the mouth of an animal improved its efficiency as a predator, and that aggression rather than protection was the driving force behind the origin of the vertebrate skeleton.<\/p>\n\n\n\n

Question 1<\/h2>\n\n\n\n

According to the passage, the anatomical evidence provided by the preserved soft bodies of conodonts led scientists to conclude that<\/p>\n\n\n\n

  • A. conodonts had actually been invertebrate carnivores<\/li>
  • B. conodonts’ teeth were adapted from protective bony scales<\/li>
  • C. conodonts were primitive vertebrate suspension feeders<\/li>
  • D. primitive vertebrates with teeth appeared earlier than armored vertebrates<\/li>
  • E. scientists’ original observations concerning the phosphatic remains of conodonts were essentially correct<\/li><\/ul>\n\n\n\n

    Question 2<\/h2>\n\n\n\n

    The second paragraph in the passage serves primarily to<\/p>\n\n\n\n

    • A. outline the significance of the 1981 discovery of conodont remains to the debate concerning the development of the vertebrate skeleton<\/li>
    • B. contrast the traditional view of the development of the vertebrate skeleton with a view derived from the 1981 discovery of conodont remains<\/li>
    • C. contrast the characteristics of the ostracoderms with the characteristics of earlier soft-bodied vertebrates<\/li>
    • D. explain the importance of the development of teeth among the earliest vertebrate predators<\/li>
    • E. present the two sides of the debate concerning the development of the vertebrate skeleton<\/li><\/ul>\n\n\n\n

      Question 3<\/h2>\n\n\n\n

      It can be inferred that on the basis of the 1981 discovery of conodont remains, paleontologists could draw which of the following conclusions?<\/p>\n\n\n\n

      • A. The earliest vertebrates were sedentary suspension feeders.<\/li>
      • B. Ostracoderms were not the earliest vertebrates.<\/li>
      • C. Defensive armor preceded jaws among vertebrates.<\/li>
      • D. Paired eyes and adaptations for activity are definitive characteristics of vertebrates.<\/li>
      • E. Conodonts were unlikely to have been predators.<\/li><\/ul>\n\n\n\n

        Solution<\/h2>\n\n\n\n

        1. Passage Analysis:<\/h3>\n\n\n\n

        Progressive Passage Analysis<\/h4>\n\n\n\n
        Text from Passage<\/th>Analysis<\/th><\/tr>
        Conodonts, the spiky phosphatic remains (bones and teeth composed of calcium phosphate) of tiny marine animals that probably appeared about 520 million years ago, were once among the most controversial of fossils.<\/em><\/td>What it says:<\/strong> Scientists found spiky remains from ancient tiny sea creatures, and these fossils caused major disagreements among scientists.

        What it does:<\/strong> Introduces the main subject (conodonts) and establishes they were mysterious\/controversial

        Source\/Type:<\/strong> Factual background information

        Connection to Previous Sentences:<\/strong> This is our starting point – no previous information to connect to

        Visualization:<\/strong> Picture tiny spiky teeth and bones scattered on the ocean floor 520 million years ago, with scientists scratching their heads trying to figure out what they came from

        Reading Strategy Insight:<\/strong> The word “controversial” signals we’re about to learn about competing theories – stay alert for different viewpoints

        What We Know So Far:<\/strong> Conodonts = spiky remains from ancient sea animals, caused scientific debate
        What We Don’t Know Yet:<\/strong> Why they were controversial, what the debate was about<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

        2. Passage Summary:<\/h3>\n\n\n\n

        Author’s Purpose:<\/h4>\n\n\n\n

        To explain how a mysterious fossil discovery resolved a long-standing scientific debate about whether vertebrates first evolved hard body parts for defense or for hunting.<\/p>\n\n\n\n

        Summary of Passage Structure:<\/h4>\n\n\n\n

        In this passage, the author walks us through how scientists solved an ancient mystery and what it revealed about evolution:<\/p>\n\n\n\n

        1. First<\/strong>, the author introduces conodonts as mysterious spiky fossil remains that puzzled scientists for a long time because no one knew what animal they came from or what they were used for.<\/li>
        2. Next<\/strong>, the author explains that a 1981 discovery of complete fossils solved this mystery and had major implications for understanding how vertebrate skeletons evolved.<\/li>
        3. Then<\/strong>, the author presents two competing theories: the traditional view that skeletons evolved for defense first and teeth came later, versus the alternative view that teeth evolved first for hunting.<\/li>
        4. Finally<\/strong>, the author shows how the conodont evidence supports the hunting-first theory, since these primitive vertebrates only had hard parts in their mouths and came before armored fish.<\/li><\/ol>\n\n\n\n

          Main Point:<\/h4>\n\n\n\n

          The conodont fossils prove that vertebrates first evolved hard body parts in their mouths for hunting prey, not for protection, which means aggression rather than defense was the main driving force behind the evolution of vertebrate skeletons.<\/p>\n\n\n\n

          Question Analysis:<\/h4>\n\n\n\n

          This question asks what paleontologists could conclude specifically based on the 1981 discovery of conodont remains. We need to identify what new information or insights became available after that discovery that weren’t available before.<\/p>\n\n\n\n

          Connecting to Our Passage Analysis:<\/h4>\n\n\n\n

          From our passage analysis, we know that:<\/p>\n\n\n\n

          1. Before 1981, conodonts were just mysterious spiky remains with unknown origin and function<\/li>
          2. The 1981 discovery revealed complete fossils showing the whole soft-bodied animals<\/li>
          3. This discovery provided anatomical evidence that conodonts were primitive vertebrates<\/li>
          4. Key finding: conodonts had basic vertebrate features but “lacked any mineralized structures apart from the elements in the mouth”<\/li>
          5. This made them “more primitive than the armored jawless fishes such as the ostracoderms”<\/li>
          6. The timeline implications: if conodonts were more primitive than ostracoderms, they came earlier in vertebrate evolution<\/li><\/ol>\n\n\n\n

            Prethinking:<\/h4>\n\n\n\n

            The 1981 discovery allowed scientists to establish evolutionary relationships and timelines. Since conodonts showed primitive vertebrate features but lacked the external armor that ostracoderms possessed, and since they appeared around 520 million years ago while ostracoderms existed from 500-400 million years ago, paleontologists could conclude that there were vertebrates more primitive than the previously known armored jawless fishes. This would mean ostracoderms were not the earliest vertebrates.<\/p>\n\n\n\n

            Answer Choices Explained<\/h3>\n\n\n\n

            A. The earliest vertebrates were sedentary suspension feeders.<\/p>\n\n\n\n

            Why It’s Wrong:<\/strong><\/p>\n\n\n\n

            • The passage states this was the traditional theory’s assumption, not a conclusion from the 1981 discovery<\/li>
            • The conodont evidence actually contradicts this – conodonts had mouth parts for hunting, suggesting they were predators, not sedentary feeders<\/li>
            • The 1981 discovery supported the alternative theory that early vertebrates were predatory<\/li><\/ul>\n\n\n\n

              Common Student Mistakes:<\/strong><\/p>\n\n\n\n

              1. Did I confuse what the traditionalists believed with what the conodonts proved?<\/em>
                \u2192 Remember that the passage presents the traditional view first, then shows how conodont evidence contradicted it<\/li>
              2. Am I mixing up the old assumptions with the new discoveries?<\/em>
                \u2192 Focus on what the 1981 discovery revealed, not what scientists assumed before<\/li><\/ol>\n\n\n\n

                B. Ostracoderms were not the earliest vertebrates.<\/p>\n\n\n\n

                Why It’s Right:<\/strong><\/p>\n\n\n\n

                • The 1981 discovery revealed that conodonts were primitive vertebrates from around 520 million years ago<\/li>
                • Conodonts lacked external armor and were “more primitive than the armored jawless fishes such as the ostracoderms”<\/li>
                • Since ostracoderms existed from 500-400 million years ago, the discovery proved there were even earlier vertebrates<\/li>
                • This directly challenges any assumption that ostracoderms represented the earliest vertebrates<\/li><\/ul>\n\n\n\n

                  Key Evidence:<\/strong> “The lack of any mineralized structures apart from the elements in the mouth indicates that conodonts were more primitive than the armored jawless fishes such as the ostracoderms.”<\/p>\n\n\n\n

                  C. Defensive armor preceded jaws among vertebrates.<\/p>\n\n\n\n

                  Why It’s Wrong:<\/strong><\/p>\n\n\n\n

                  • This was the traditional theory that the conodont discovery actually contradicted<\/li>
                  • The evidence showed that mouth parts (teeth) evolved first, not defensive armor<\/li>
                  • The final conclusion states that “aggression rather than protection was the driving force”<\/li><\/ul>\n\n\n\n

                    Common Student Mistakes:<\/strong><\/p>\n\n\n\n

                    1. Did I confuse the traditional theory with the conclusion?<\/em>
                      \u2192 The traditional theory said armor came first; conodonts proved teeth came first<\/li>
                    2. Am I reading the wrong part of the debate?<\/em>
                      \u2192 Look for what the conodont evidence supported, not what traditionalists originally believed<\/li><\/ol>\n\n\n\n

                      D. Paired eyes and adaptations for activity are definitive characteristics of vertebrates.<\/p>\n\n\n\n

                      Why It’s Wrong:<\/strong><\/p>\n\n\n\n

                      • This was already established knowledge mentioned by the alternative theorists, not a new conclusion from the 1981 discovery<\/li>
                      • The passage presents this as part of the existing alternative theory’s reasoning<\/li>
                      • The 1981 discovery provided evidence about evolutionary sequence, not about defining characteristics<\/li><\/ul>\n\n\n\n

                        Common Student Mistakes:<\/strong><\/p>\n\n\n\n

                        1. Did I mistake existing scientific knowledge for new discoveries?<\/em>
                          \u2192 Focus on what became possible to conclude after 1981, not what was already known<\/li>
                        2. Am I confusing the alternative theory’s premises with the conodont evidence?<\/em>
                          \u2192 The question asks specifically about conclusions from the 1981 discovery<\/li><\/ol>\n\n\n\n

                          E. Conodonts were unlikely to have been predators.<\/p>\n\n\n\n

                          Why It’s Wrong:<\/strong><\/p>\n\n\n\n

                          • The conodont evidence actually suggested the opposite – that early vertebrates were predators<\/li>
                          • Conodonts had hard mouth parts that “improved efficiency as a predator”<\/li>
                          • The final conclusion emphasizes that “aggression rather than protection was the driving force”<\/li><\/ul>\n\n\n\n

                            Common Student Mistakes:<\/strong><\/p>\n\n\n\n

                            1. Did I misread the conclusion about what conodonts were used for?<\/em>
                              \u2192 The evidence points to predatory function, not away from it<\/li>
                            2. Am I confusing the traditional view of early vertebrates with what conodonts showed?<\/em>
                              \u2192 Conodonts were different from the traditional model – they were hunters, not passive feeders<\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"

                              Conodonts, the spiky phosphatic remains (bones and teeth composed of calcium phosphate) of tiny marine animals that probably appeared about 520 million years ago, were once among the most controversial of fossils. Both the nature of the organism to which the remains belonged and the function of the remains were unknown. However, since the 1981 […]<\/p>\n","protected":false},"author":102457,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","ub_ctt_via":""},"categories":[44,108],"tags":[],"featured_image_src":null,"author_info":{"display_name":"Kashish Garg","author_link":"https:\/\/e-gmat.com\/blogs\/author\/kashish\/"},"yoast_head":"\nConodonts, the spiky phosphatic remains (bones and teeth composed of calcium.....<\/title>\n<meta name=\"description\" content=\"Conodonts, the spiky phosphatic remains (bones and teeth composed of calcium phosphate) of tiny marine animals that\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/neuron.e-gmat.com\/verbal\/questions\/conodonts-the-spiky-phosphatic-remains-bones-and-teeth-composed-of-c-29.html\" 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