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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Many body systems work together for proper functioning of the body and to maintain internal homeostasis. the works to break down food eaten before exercising. the takes in the nutrients obtained from the food. the body sweats as a mechanism to cool off, because the is working to flush out toxins.
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21. Which discovery would challenge the validity of this cladogram?
A. A large aquatic vascular pl...
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