atoms and molecules that make up a rock a>never move b>are in constant motion c>move when the rock is broken d>move when the rock is melted

I am not a outstanding chemist so forgive me if I am wrong but I think the answer would be

a>never move

I say this because one a rock is a solid and two even when broken I believe that would be Braking apart chemical bonds not moving atoms but again I am just going of rust high school chemistry knowledge.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.