Answer:
Phytoplankton production is necessary to begin a food web in an ocean ecosystem.
Explanation: Hope it helps you :)))))))
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Answer:
A. solar energy in the rays of sunlight
Explanation:
photons in the sunlight rays will excite the electrons in the water molecule and hence will provide the energy for calvin cycle.
 
        
             
        
        
        
A commensal bacterium does not infect its host, which is option D. Details about commensalism can be found below. 
<h3>What is commensalism?</h3>
Commensalism is a kind of relationship that involves the sharing of the same environment by two organisms where one species benefits and the other is unaffected.
For example, barnacles on whales is a commensalistic relationship. 
According to this question, a commensal bacterium will not affect or harm it's host by infect it neither will it benefit its host. 
Learn more about commensalism at: brainly.com/question/14224704
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