The blank is the fluid component of blood

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

What is the inability of an individual or a society to achieve a minimum standard of living known as ?

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?