Greenhouses are buildings that are made out of transparent (see-through) materials, such as glass. They are used to keep
plants at a comfortable temperature. They work by allowing
the heat of the sun in, and then trapping some of the heat
from escaping the building, keeping the temperature in the
greenhouse warm.

The answer would be sand and gravel

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The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar  flies (drosophila). one  sample revealed an anomaly: a  white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs)  produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait.