Answer: A
Evolution is the idea that species change over time, and natural selection is a mechanism by which evolution takes place.
        
                    
             
        
        
        
Declining krill populations will have catastrophic consequences for ecosystem homeostasis and it will increase the levels of phytoplankton.
<h3>What is ecosystem homeostasis?</h3>
The term ecosystem homeostasis makes reference to the state of equilibrium between different species in an ecosystem.
Krill are fundamental primary consumers in aquatic environments and they eat autotrophic phytoplankton. 
In conclusion, declining krill populations will have catastrophic consequences for ecosystem homeostasis and it will increase the levels of phytoplankton.
Learn more about ecosystem homeostasis here:
brainly.com/question/1514975
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<span>With an enzyme, the activation energy of the reaction decreases, which increases the reaction rate. 
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Egg proteins are necessary for an embryonic development