Make/produce and secrete hormones
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The damage to ozone layer is done by halogens such as Chlorine and Bromine.
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4. p.complement system c.saliva b.sneezing
Passive diffusion is a form of passive transport and a type of diffusion by which particles from a high concentration gradient passes through a biological membrane to a low concentration gradient. Diffusion, or simple diffusion on the other hand, is the passage of molecules without the need of a membrane.