In premature births, one of the dangers that must be overcome is the difficulty in inflating the baby's lungs, because the surfactant has not yet reached an adequate level. In order to breathe, the infant must expand its lungs, breaking down the
bonds between fluid molecules that are trying to keep the lungs from expanding.

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