The 2 main characteristics of active transport are that energy is needed in the form of ATP to move molecules and other ions against the concentration gradient, from low to high concentration of the said substance and also the transport is mediated or assisted by certain carrier proteins, a certain kind of transmembrane protein that spans across the complete width of the membrane.
It's <em><u>false</u></em>, because the most materials are absorbed into the bloodstream in the small intestine.
Answer:
B. The Sun
Explanation:
This is because almost everything needs sun to live. It is a continuous cycle. If there is no sun for a long period of time, most things will die, or start to wilt if it is a plant like grass.
Answer:
The primary function of red blood cells is to transport oxygen to body cells and deliver carbon dioxide to the lungs.
Explanation:
