<span>C. controls which substances enter and exit the cell
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Answer:
<u>
They have hydrophilic heads and hydrophobic tails.</u>
Explanation:
Phospholipid membranes are comprised of a chain of lipids. These typically are arranged in a bilayer; the hydrophilic lipid heads are polar, and face outwards, while the hydrophobic tails are polar facing inwards.
The membranes are selectively permeable, and only allow the movement of small, non-polar molecules through the bilayer.
Most populations don’t grow exponentially since there is regulations considering CBR & CDR, as well as NIR in the whole population. There are push factors as well a limited growth.
