Which of the following would be expected to have the greatest impact on primary productivity?
a chemical energy
b. nutrient availability
C. solar energy
d. water availability
Please select the best answer from the choices provided
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Solar energy would have the greatest impact on the primary productivity.

Explanation:

The autotrophs are the primary producers which create organic compound by photosynthesis in the presence of sunlight.

The energy flow is initiated by autotrophs alone and energy flow in ecosystem is by the photosynthesis.

So the primary productivity depends upon the solar energy to perform photosynthesis and flow of energy in trophic level is maintained.

The organic compound as glucose is the source of energy for all consumers.

it is known that if primary productivity is imbalanced the whole food chain, trophic levels and ecosystem will be disturbed.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

the most logical answer would be a