A large number of species in an ecosystem can be collectively termed as biodiversity.
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The term used to describe a harmless organism resembling a harmful one is batesian mimicry. Cryptic coloration or camouflage makes prey difficult to spot, while aposematic coloration is a type of coloration exhibited by animals with effective chemical defenses. Mullerian mimicry is a type of mimicry in which two or more unedible species resemble each other.