The most abundant element is oxygen...found in the crust and in the atmosphere.
Answer:
D
Explanation:
non homologous chromosomes basically have nothing to do with each other, so they are not associated with one another during the formation of gametes.
Selective permeability, made possible in cells by the phospholipid bilayer that makes up the plasma membrane, is basically monitoring and regulating what can and can't enter the cell. It is carried out by a series of membrane proteins that act as channels to polar molecules, opening to allow them in and closing to prevent their entry. This is possible because the hydrophobic tails of the phospholipid molecules repel polar molecules and so prevent their entry unless through a channel.