Biology

When a cell's surface area to volume (SA:V) ratio decreases, the correct answer is: B.The rate of material exchange (nutrients, waste) decreases.

Explanation:

As a cell increases in size, its volume grows faster than its surface area, leading to a lower SA:V ratio. This reduction in surface area relative to volume means the cell has less surface area available for exchanging materials like nutrients, gases, and waste. Consequently, diffusion of materials in and out of the cell becomes slower and less efficient, which can limit the cell's ability to function effectively.

The other options are not directly related to a decreased SA:V ratio: