Which of the following are true of scientific hypotheses? (Check all that apply.)
They can represent someone's opinion about why change occurs.
O They can be tested through observations of natural events.
O They must be rejected if no evidence is found to support them.
They must be agreed upon by all scientists before they are tested.
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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