Which best explains how a blond-haired child can be born to two parents with black
hair?

A. A mutation occurred in the child's genes for hair color.

B. Both parents, who were blond as children, experienced a darkening of hair color as they aged.

C. Blond hair is always a dominant trait.

D. The child inherited a recessive trait for blond hair from both parents.

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