IDNLearn.com is your go-to platform for finding accurate and reliable answers. Our experts are available to provide accurate, comprehensive answers to help you make informed decisions about any topic or issue you encounter.

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