Some ____ in a species are not well ____ to ____ in their environment. This means that they ____ without ____ and their adaptations don't get passed on. Over a long time, this can lead to the ____ of a species by ____ selection. Some times, changes in the ____ or ecosystem mean changes can happen very ____. This could be natural (new ____ hunting or new ____ affecting plants/animals) or caused by humans (changing ____ due to global ____, ____ in water, or destruction of ____). This can sometimes lead to ____ species not being able to ____, rather than just some of them. When ____ of the organisms die out, the species has become ____.

Extinction

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