The form of cholesterol that shuttles cholesterol back to the liver for recycling is a. low-density lipoprotein. b. triglycerides. c. high-density lipoprotein. d. saturated fat.

1. is geographic distribution

2 is increasing complexity

3 is transitional forms

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide

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