Answer: effects of the evolution of photosynthesis. Photosynthetic organisms dramatically increased atmospheric oxygen levels between 2 and 2.5 billion years ago. This change created selective pressure favoring organisms that used oxygen to produce energy-containing molecules.
change the wording a little bit.
Explanation:
I believe its B because once its ferilized the egg being to change to grow into a baby
Answer:
Explanation:
Check the dna of space rocks