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.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg