Question

What is meant by a substance​

Answer 1

Answer:

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Explanation:

Photoreceptors are the cells in the retina that respond to light. Their distinguishing feature is the presence of large amounts of tightly packed membrane that contains the photopigment rhodopsin or a related molecule.

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Answer 2

Answer:

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A substance is a matter that has definite properties and composition. Every pure compound and element is a substance. Water, H 2 O, is a pure substance, a compound made of hydrogen and oxygen. Every pure substance is homogeneous.