1000!
Que tengas bonito día!
Answer:
<em>The correct option is A) increase in atmospheric O2</em>
Explanation:
The nerve cells and the muscle cells suggest that the the presence of oxygen in the atmosphere was an adaptive radiation which brought the existence of different animals. The conditions became favorable for different animals to survive on Earth only when the availability of oxygen improved in the atmosphere. As animal cells like the muscle cells require a constant supply of oxygen, we can hence say that increase in atmospheric oxygen was the adaptive radiation for supporting many group of animals.
Its somethings like; Lincoln has noted a gradual enlargement of his body tissues. He is long past puberty, but the bones of his face and jaw seem to be growing thicker and changing shape. Even his hands and feet look larger (I don't know all of it but that's most)
B. Egg is the female reproductive cell. Hope this helped, Enjoy the rest of your day!!!!!!!!!!! :)
