Question

what process concentrates calcium within the cell? facilitated diffusion osmosis active transport

Explanation:

To determine the process that concentrates calcium within the cell, we analyze each option:

• Facilitated diffusion moves substances down their concentration gradient (from high to low), so it can't concentrate a substance within the cell.
• Osmosis is the movement of water across a semipermeable membrane, not related to concentrating calcium.
• Active transport moves substances against their concentration gradient (from low to high) using energy, which is necessary to concentrate calcium inside the cell (as calcium levels outside the cell are often higher, so moving it in against the gradient requires active transport).

Answer:

C. active transport (assuming the options are labeled A: facilitated diffusion, B: osmosis, C: active transport; if the original options had different labels, adjust accordingly, but based on the content, the correct option is the one with "active transport")