Which always contains carbon, hydrogen and oxygen?
i. carbohydrate
ii. protein
iii. fat
a. i and ii only
b. i and iii only
c. ii and iii only
d. i, ii and iii

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; i believe its (ovulation);