Animals get the most of the nitrogen they need a a by consuming plants or other animals. b by breathing in atmospheric nitrogen. c directly from bacteria in the soil. d from the process of denitrification.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;