Why do some organisms have to do chemosynthesis instead of photosynthesis?
(A
They have no light
(BThey have no oxygen
(CThey have no carbon dioxide
D) They have no water

A

Explanation:

Generally, chemosynthesis is carried out in the absence of light.  Some common chemosynthetic bacteria live by hydrothermal vents, and can extract water and carbon dioxide from the water, thus fulfilling B, C, and D.  However, many of such bacteria actually use sulfur compounds or methane compounds to obtain energy.

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i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.