They add nitrogen to the soul through their nodules !
There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA.
Years would be the independent variable because any sort of time is usually the independent variable.
Answer:
A theory is a group of hypotheses that prove a law is true.
Explanation:
A theory is an idea based on principles. A hypothesis is an explanation with limited evidence. Laws are the system of rules indicated for each country.
The correct answer is C.) Rainfall
