During embryonic development the vessels of the vasculature must correctly connect. which of the following molecules mediate this event?
a. wnt3 and frizzled
b. notch1 and jagged1
c. shh and smoothened
d. ephrin b2 and eph b4

the answer is

c. parental

d is the answer

sorry if its wrong!

answer: 45

explanationyou have to add as well to be it could be

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