The removal of which tropic level of the food chain would have the biggest effect on the ecosystem? a) crabs b) fish c) whales d) plankton (i think it’s plankton)

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

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Which of these is most likely to happen if parallax measurements of star distances are taken after a gap of six months? the results would be accurate the results would be inconsistent the results would not be valid the results would not be repeated