The cell's membrane is known as semipermeable (also called selectively permeable) as it will not normally allow charged or large substances through. Small uncharged substances may cross the
semipermeable membrane with the concentration gradient. This occurs in order for the cell to utilize
these molecules in various cellular functions. What is this process of select molecules moving freely
across the semipermeable membrane called?

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

the answer to you question is   jet streams

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.