When heat is added to a substance, it melts because the molecules move faster.
Different organisms moved in and out (notably, bacteria moved into a taxonomic kingdom of their own). ... In this system there are three main branches or "domains" of life: Bacteria, Archaea (both prokaryotic) and Eukarya (the eukaryotes). Within the eukaryotic domain, the protists are no longer a single group.
The principal components of the plasma membrane are lipids (phospholipids and cholesterol), proteins, and carbohydrate groups that are attached to some of the lipids and proteins. A phospholipid is a lipid made of glycerol, two fatty acid tails, and a phosphate-linked head group.
