Why don't the present shapes of the continent's fit perfectly into a supercontinent

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

The structure of cells has changed significantly overtime. what concept explains the presence of mitochondria in cells?

Some animals shiver as a natural, involuntary response to their environment. shivering generates heat. this is an example of which function? reducing movement to regulate body temperature reducing movement to regulate blood glucose maintaining homeostasis by regulating body temperature maintaining homeostasis by regulating blood glucose