Which substance is considered a teratogen?
a. DNA
b. Estrogen
c. Androgen
d. Lactic acid
e. Nicotine

answer; i believe the correct answer is (a)0

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101