A semi-permeable cell membrane is most like a A college professor in a lecture. B small child in a high-chair. C bouncer at a club. D soldier in battle.

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos