1. Your cells require many substances (molecules) to maintain homeostasis. Name as many examples of substances that are required to enter your cells. 2. What type of molecules would need to exit your cells?

3. Through what cell structure (organelle) must these molecules use to enter and exit through? Create an analogy for this cell structure

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