Sleep is an example.
Circadian rythms are biological processes that repeats itself within a certain time frame, as sleep repeats itself approximately once every day.
A.) Convention currents in Earth's mantle
The given statement is True.
The transport process that does not requires the consumption of ATP molecules is called as passive transport. The movement of solute molecules along the concentration gradient (from higher concentration to lower concentration) is called diffusion. This process does not requires ATP for the movement of molecules from one place to another.
All elements are made of "atoms", and an atom is made up from 3 basic particles: Electrons are particles with a negative charge :)