| SPEC | evolve so as to lead to a new species or develop in a way most suited to the environment, of populations of plants and animals |
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| SPEC | the evolution of a biological species |
| SPEC | coins collectively |
| SPEC | a specific kind of something |
| SPEC | (biology) taxonomic group whose members can interbreed |
| SPEC | capable of being specified |
| SPEC | a medicine that has a mitigating effect on a specific disease |
| SPEC | a fact about some part (as opposed to general) |
| SPEC | stated explicitly or in detail |
| SPEC | (sometimes followed by `to') applying to or characterized by or distinguishing something particular or special or unique |
| SPEC | (medicine and pathology) being or affecting a disease produced by a particular microorganism or condition |
| SPEC | relating to or distinguishing or constituting a taxonomic species |