Ancient cyanobacteria released oxygen, <span>which assisted in creating the atmosphere as we know it today. The correct option among all the options that are given in the question is the fourth option or option "D". I hope that the answer has actually come to your great help.</span>
Spongy bone is very soft and is within the bone while compact bone protects the organs found in the bone.
Answer:
D
Explanation:
Sexual reprduction is when a sperm cell fertilzes an egg cell.
