What is one of the reasons why Gregor Mendel chose to study pea plants? A. They exhibit only a single trait.
B. They produce flowers
C. They grow very slowly
D. They reproduce sexually

D

Explanation:

Just took the test on edgunity hope this helps :)

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands