Jenna's dog eats a mixture of dry and canned dog food. when she feeds him, she pours some dry dog food into a bowl and gets a can of dog food out of the pantry. she plugs an electric can opener into an outlet to open the can. to open the can, the can opener converts electric energy into which of the following? a. chemical energy b. mechanical energy c. potential energy d. radiant energy

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