Question

how do the brains of birds and mammals compare to other groups of vertebrates?
a the ratio of brain size to body weight for birds and mammals is about ten times greater than other groups of vertebrates.
b birds and mammals have proportionately larger hindbrains than other groups of vertebrates.
c birds and mammals have much smaller brains relative to body size than other groups of vertebrates.
d the brains of birds and mammals have proportionately larger midbrains than other groups of vertebrates.

Explanation:

Birds and mammals are known for having relatively larger brains compared to their body size. The ratio of brain size to body weight for birds and mammals is about ten times greater than other groups of vertebrates. This is a key characteristic that differentiates them from other vertebrate groups.

Answer:

A. The ratio of brain size to body weight for birds and mammals is about ten times greater than other groups of vertebrates.