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: When there is an '''environmental change''' this can change or destroy a [[habitat]].
: '''Environmental change''' can cause certain species to die.
: Too much [[rain]] can cause [[flood]]s which kill [[organism]]s that live underground.: If there is not enough [[rain]] it causes a [[drought]] and [[organism]]s can become [[dehydrated]] and die.
: If a [[habitat]] gets too cold lots of the [[organism]]s might die.