What is this desert biome composed of? Select all that apply. Organisms
Biospheres
Populations
Ecosystem

Choose the molecule that is described by each phrase. energy used during long activities:

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

Which part of cellular respiration must occur before any of the other steps can occur