Howard is making a class presentation about the process of abrasion and he wants to model the process. Which of these can Howard do to model the
process of abrasion?

A. Pour water over a pile of sand

B. Rub a soft rock on a rough surface

C. Put flat iron fillings in a beaker of water

D. Place a Few small drops of acid on a rock.

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.

your answer is true

i am 100% sure

explanation: