a. according to this tree, which pairs of organisms are most closely
related?

b. which organism is most closely related to the rayfinned fish?

c. which organisms are the mammals most closely related to?

A= Salamanders and frogs

lizards and snakes

crocodiles and birds

B= lungfish

Explanation:

for A, I used the chart to see which animals were on the same branch

for B, I used the chart to see which animals were closest to the same branch

I had some difficulty with C

i think its c. amphipod