___step of action potential is energy dependent

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Depolarization of membrane potential, and how does change in membrane potential trigger graded and action potentials for the transmission of signals

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Shark is a kind of fish  mostly fishes have s cales

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Sea cucumbers have no arms , no spines and no pedicellariae. Sea Lily: Sea lilies belong to the class Crinoidea of phylum Echinodermata.

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Water pollution  occurs when harmful substances often chemicals or microorganisms—contaminate a stream,  river , lake, ocean, aquifer, or other body of  water ,

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A carnivore is an animal that gets food from killing and eating other animals. Carnivores generally eat herbivores, but can eat omnivores, and occasionally other carnivores

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Cell is devide by  the process by which a parent cell divides into two or more daughter cells

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A region is arid when it is characterized by a severe lack of available water, to the extent of hindering or preventing the growth and development of plant and animal life.

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he speed of early printers was measured in units of characters per minute (cpm) for character printers