Endocytosis is an energy-using process. The answer is A.
Symbiosis is the ecological relationship between two or more organisms living closely together with some form of feeding relationship involved. The three main symbiotic relationships are: - Mutualism, where both organisms benefit. - Commensalism, where one organism benefits while the other organism is not harmed. All of them thrive off of the other organism.
Carbon is relatively small. non - bulky atom that shares electrons easily .
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