Circle the correct answer for the cladogram question below. The cladogram shows the evolution of land plants as indicated by fossil records. 21. Which discovery would challenge the validity of this cladogram? A. A large aquatic vascular plant about 200 million years old B. A species of algae that has existed for less than one million years C. A moss species that has existed for less than 380 million years D. A fossil of a fern more than 425 million years old

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Circle the correct answer for the cladogram question below. The cladogram shows the evolution of land plants as indicated by fossil records. 21. Which discovery would challenge the validity of this cladogram? A. A large aquatic vascular plant about 200 million years old B. A species of algae that has existed for less than one million years C. A moss species that has existed for less than 380 million years D. A fossil of a fern more than 425 million years old

Answer 1

D. A fossil of a fern more than 425 million years old<br /><br />This discovery would challenge the validity of the cladogram because it suggests that ferns existed earlier than currently indicated by the fossil record in the cladogram. If ferns are shown to have existed before 425 million years ago, it would require a reevaluation of the evolutionary timeline and relationships depicted in the cladogram.

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