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paramecia that live in freshwater have contractile vacuoles, while those that live
in salt water do not. why do you think this is the case?
where in the cell are might you find proteins? explain why?
where in the cell are might you find lipids? explain.

when the salt outside of the paramecium is higher that the amount of salt inside a paramecium ,then they need all of the water they can get as a result they do not need contractile vacuole to contract.

ribosomes make protein which is found in cytosol.

lipids are present in the outer layer of the cell.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.