The water table rises and falls with precipitation is the bottom layer of the saturated zone is a layer of porous rock below an aquifer always stays in the same place

The correct option among all the options that are given in the question is the first option or option "a". It is important to know what a water table is. It is basically the level below which the ground water that is present is always in a saturated condition. I hope it helps you.

The water table rises and falls with precipitation.

Proteins are marked for degradation by the attachment of ubiquitin to the amino group of the side chain of a lysine residue. Additional ubiquitins are then added to form a multiubiquitin chain. Such polyubiquinated proteins are recognized and degraded by a large, multisubunit protease complex, called the proteasome.