All organisms contain and require it to survive a. helium b. carbon c. zinc d. polonium

Carbon

Explanation:

Carbon is the most essential element to make organic compounds found in all organisms.

That's why carbon dating technique is used to know the age of fossils of any organisms.

it is a

explanation:

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