1 billion years for oxygen to become a large component of Earths atmosphere
Answer:
A
Explanation:
others answers give variables that still apply to planets
<span>urinary bladders i hope this helps</span>
B. plants can begin to grow under snow, grow close to the ground, and flower quickly i think
Answer:
Genetics- this is the scientific study of genes and heredity.
Breeding- The production of offspring by animals.
