Acuckoo may lay its egg in a warbler's nest. the cuckoo's young will displace the warbler's young and will be raised by the warbler. is this relationship commensalism or parasitism?

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.