The maximum size of a cell is limited by . its need for enough surface area to make exchanges with its environmentb. the amount of flexibility it needs to be able to movec. the materials needed to build itd. the number of organelles that can be packed inside

A

Explanation:

The cell size is limited by the need for adequate surface area for gas exchange. The more the size the less the surface area.

The surface area to volume ratio of a cell must be such that the cell membrane has enough surface area to adequately serve the internal contents (volume) of the cell, including the adequate exchange of gases. As the cell grows, its surface area to volume ratio decreases, reducing the rate of gas exchange.

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d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.