Fishes have great flexibility when they swim because they have
a. separate vertebrae
c. scales
b. no limbs
d. no skin

for the points

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

the tricuspid valve is present between right atrium and right ventricle

c is the answer. hope this