1. Classification Tree

3. Classification Tree
According to the classification tree, which of these is more closely related to birds -- mammals or reptiles?
How do you know?
Because the reptiles branch is closer to birds than mammals.

5. Classification Tree
2. According to the classification tree, which of these is more closely related to mollusks – segmented worms or spiders?
How do you know?
Because the segmented worms branch is closer to mollusks than spiders.

7. Classification Tree
Put the following in order in which they evolved: echinoderms, amphibians, spiders, flatworms, birds, and roundworms.
A. flatworms (FIRST)
B. roundworms
C. echinoderms
D. amphibians
E. spiders
F. birds (LAST)