What three roles do fats play in in maintaining an organism

What is an animal that lives by preying on other animals

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

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