There are two groups of earthworms on the sidewalk. one group is on a shady, moist area on the sidewalk, and they are moving. the other group is on a very sunny, dry area of the sidewalk, and none of the worms in this group are still living.
what question could be asked to investigate the reason for these observations?
a. what kinds of birds eat earthworms?
b. how do earthworms get on the sidewalk?
c. what kind of living environment do earthworms need?

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

What initially causes a nerve impulse? release of enzymes out of the neuron movement of chemicals into the dendrites of the neuron pathogens attacking the dendrites of the neuron red blood cells bathing the neuron

Hey me with this one❤☺❤ how do you say that a cell also has a life span and death like an organism? give one example.