The contractile vacuole is an organelle found in paramecia, a group of unicellular organisms. contractile vacuole pump out fresh water that accumulates in the organisms by osmosis. explain how this is an example of the way paramecia maintain homeostasis?

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.

cell division is not regulated in tumor cells.