Where organisms are better adapted to their environments tend to survive and produce more kids!
It indicates what elements is composed by and how many atoms of one element are linked to the other.
For example, this is the formula for table salt is:
NaCl
The formula indicates that table salt (sodium chloride) is composed by sodium (Na) and chlorine (Cl) on a 1:1 ratio.
Hope it helped,
BioTeacher101
1. Small Intestines
2.Vitamins
Sorry i don’t know the others