If youre talking naturally, cells on animals often die to create your bodies main protection, skin, nails, hair. They're all dead and referred to as the epidermis. They keep animals warm and in trees...
A mutation can benefit an organism if it helps it survive in its environnment. For example, let's say a bug is normally white and lives on white barked trees. Suddenly a volcano explodes and the...
Micro-organisms are beneficial to other organisms in many ways; in the grand scheme of the world, microorganisms are recyclers of waste because they can decompose compounds and release them back to...