define diffusion, spiracles and gills?
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Diffusion is the spontaneous movement of gases, without the use of any energy or effort by the body, between the alveoli and the capillaries in the lungs. Perfusion is the process by which the cardiovascular system pumps blood throughout the lungs.
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the intermixing of particles of diffrent types on their own is known as diffusion
spiracles are the tails of octopus
gills that are present in fish to breathe
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