Identify the correct name or abbreviation for the given nucleoside or nucleotide.

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

What is a group of organisms that are closely related and share similar characteristics

Why do we perceive objects as retaining their brightness under different lighting levels?