According to the cladogram shown, which two animal species shared the most recent common ancestor?
a. primates and crocodiles
b. birds and rodents
c. sharks and birds
d. birds and crocodiles

Birds and Crocodiles (Ans. D)

Explanation:  

Birds and Crocodiles shows most recent common ancestor because they are part of much larger group known as Archosauria (ruling lizards). When they both species divided from each others, they divided into 2 major evolutionary pathways:

The bird-line archosours , and the second one is crocodile-line archosours (which includes crocodilians and their ancestors).

So, Crocodiles are the closest living relatives of the birds and they sharing the most common ancestor.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.