The fact that water is a molecule is important, because this allows it to dissolve many substances. A) binary

B) covalent

C) light

D) polar

Polar. Because water is polar, it is able to dissolve things, and carry material in and out of cells.

D) polar

Explanation:

Water's property of high polarity gives it the ability to dissolve many chemicals because hydrogen has a positive electrical charge and oxygen has a negative electrical charge. This substance makes up the majority of your cells, and is necessary for them to carry out most of their chemical reactions.

The polar molecules dissolves polar substances in it. THIs is the reason that the polar substances like sodium chloride, magnesium chloride dissolves in water.

The non polar substances such as oil does not dissolves in water as they are not attracted by the water molecules.

This concept is "like dissolves like".

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.