During the age of the dinosaurs, most mammals grew no bigger than a?

T-rex

Explanation:

it should be all of them because it asks if you included all of those in your answer

explanation:

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates