What characteristics is the ancestor of tetrapods thought to have had? Choose all that apply

What is the embryonic characteristic that evolutionarily makes echinoderms proximal to chordates?

What is a radula and what is its function?  What is a mantle and what is its function?

Tetrapod limbs with joints, to allow for dexterity in terrestrial habitats, and a 3-chambered heart, first appeared in which of the following chordate groups (between 359 and 299 MYA)? the amphibians the mammals the birds the reptiles the agnathans

What does the image say about the bones in the fins of fish (on the left side) when compared to the bones in their tetrapod ancestors (on the right side)? They are homologous structures Nothing can be concluded about the relationship They are analogous structures The structures are unrelated

What are similarities exist among Lycopods and horsetails? What are some of the differences

How did the characteristic differences between aquatic and terres-trial environments influence the early evolution of tetrapods?

Use the photo and fossil of this specimen (they are from the same species that was an ancestor to a modern class of tetrapods) to answer the following: What class of tetrapod would you predict this specimen belongs to? What features of the body make it resemble the class you provided? What MAJOR ABILITY would this specimen lack that the class above would have? What is the name of this type ancestral specimen?