Posted: August 12th, 2016

It is generally thought that animals have undergone four major physiological and anatomical innovations during their evolution. These are (in no particular order)

It is generally thought that animals have undergone four major physiological and anatomical innovations during their evolution. These are (in no particular order)

A. bilateral symmetry, development of tissues, origin of the multichambered heart, origin of patterns of embryonic development.

B. development of the versatile forelimb, multicellularity, origin of patterns of embryonic development, development of tissues.

C. origin of patterns of embryonic development, development of the versatile forelimb, origin of the multichambered heart, multicellularity.

D. multicellularity, bilateral symmetry, origin of patterns of embryonic development, development of tissues.

E. development of tissues, photosynthesis, bilateral symmetry, multicellularity.