Hello

hemoglobin , how is it imporatnt in efficiency of gas exchange? ? ?
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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

How do cells grow and reproduce to maintain homeostasis?

Aheterozygous normal male marries a woman with a sickle cell anemia. give the genotypes and possible phenotypes of the offspring