Answer:
A cell is the smallest unit of a living thing.
<span>Covalent bonds are one of four types of chemical bonds. The other three are ionic bonds, metallic bonds and hydrogen bonds. Each bond type differs in the way atom share electrons. In covalent bonds, two atoms completely share one or more pairs of electrons.</span>
If the earth didn't rotate, currents would flow in straight lines from pole to equator. :)
