The ability of water to act as a solvent for so many substances is due to its .

The ability of water to act as a solvent for so many substances is due to its structure, it can dissolve many ionic and polar molecules

Explanation:

polar nature Water's tendency to share electrons unequally makes it a polar molecule. The slight charge on either side of the water molecule allows it to bond (create a solution) with any atom with a positive or negative charge.

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b - the respond is innate and varies over time.

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i believe the answer is pupils are unequal and non-reactive

the pupil of both eyes has different size, so you could say the pupil is unequal. pupil has muscle that makes it able to constrict itself according to the light intensity. when the doctor direct their flashlight to the eye, pupil should be constrict to reduce the light intensity. if the pupil doesn't change their diameter, it is called unresponsive.