What statement is true of channel and carrier proteins? A)Channel and carrier proteins can only move substances in one direction.

B)Channel proteins undergo a shape change, while carrier proteins do not.

C)Channel and carrier proteins always move substances from the side of the
membrane with the highest concentration to the side with the lowest concentration.

D)Channel and carrier proteins always move substances from the side of the membrane with the lowest concentration to the side with the highest concentration.

one would be wind another would be water density

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

you know they are heterozygous for a trait because they have it as jj or jj.