Regarding the Evolution of Specialized Animal Structures

Multiple Choice

Regarding the evolution of specialized animal structures,

A) the environment imposes identical problems on all animals regardless of where they are found.
B) the evolution of structure in an animal is influenced by its ability to learn.
C) the simplest animals are those with the most recent appearance among the biota.
D) short-term adjustments to environmental changes are often mediated by physiological organ systems.
E) the most complex animals are the ones with the most ancient evolutionary origin.