Which one below shows the 5 levels of environment in order from the simplest level to the most complex? A. ecosystem, organism, community, population, biosphere

B. organism, community, population, ecosystem, biosphere

C. organism, population, community, ecosystem, biosphere

D. biosphere, ecosystem, community, population, organism

PLEASE PLEASE PLEASE GIVE ME ANSWER IM TAKING A TEST

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

Which of the following is not a defining characteristic of plants?

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol