A simple google search of that exact answer will show that "In a human egg or sperm, there are 23<span> chromosomes, one of which is an X or Y. The number of chromosomes is reduced from 46 to 23 during the process of meiosis. Fertilization of the egg by the sperm restores the diploid number of 46 chromosomes."</span>
the answer is a <u><em>phospholipid bilayer</em></u>
it's called phospholipid because it's made of a group of lipids that has a phosphate group and bilayer because it's made of hydrophilic heads that are exposed to the solution and hydrophobic tails that are directed inwards
