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Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Gene expression is the activation of a gent that results in a question 1 options: protein dna mitochondria