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It depends on your teacher, it should be A. It could be B if that’s what your teacher wants but I would go with A.
It is useful for an ecologist to identify the keystone species in an ecosystem because the keystone species is important to maintaining the stability of an ecosystem, and any changes in the keystone species population shows that there is changes in ecosystem health.
Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into ATP (adenosine triphosphate), and then release waste products. <span>There are </span>3 major<span> steps in </span>cell respiration:<span> glycolysis, Krebs Cycle, and the electron transport chain.</span>
