Why is the cell membrane described as selectively permeable? 1.) substances are not allowed into the cell
2.) substances diffuse freely in and out of the cell
3.) some substances pass into the cell while others cannot
4.) some substances can move into the new cell but not out of the cell

What kind of seafood would you expect to have the highest levels of mercury and why? kelp, because they use the sun to photosynthesize on the bottom trophic level. oysters, because they filter feed on plankton on a lower trophic level. small fish, because they eat plankton on a higher trophic level. sharks, because they feed on organisms on a higher trophic level.

What is the number of phosphates in an atp molecule

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. which punnett square represents the correct way to set up the cross rryy  ´  rryy?