The cell is 80% calcium, and the cell's environment is 20% calcium for active transport to take place.
<h3>What is Active transport?</h3>
This is defined as the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration against the concentration gradient.
Option D involves movement of calcium into the cell from the environment which has a lowerconcentration to the cell with a higher concentration which depicts active transport .
