Submit your report on a symbiotic relationship. Word Count: of 500

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

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous

Why are current extinctions of concern to enviromentalists?