<span>All natural radiation is at a level low enough to be safe</span>
Answer:they monitor it through a modern system machine, it's important because we need to know the population we have.
Explanation: which means are we increasing it reducing in our population
The cell membrane<span> is selectively permeable to ions and organic molecules and controls the movement of substances in and out of </span>cells<span>. The basic </span>function of the cell membrane<span> is to protect the </span>cell<span> from its surroundings. It consists of the phospholipid bilayer with embedded proteins.</span>
