True or false: arid regions have complex systems of rivers and streams that drain excess water from the region into oceans

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.

They formed the oceans.  as they melted water was formed and the water made the oceans

Ten percent of energy is transferred from sun to the level indicated.