Pls dont have much time
sometimes human actions can have both positive and negative environmental impacts.

a negative impact of a large, hydroelectric dam is that it backs up water sometimes for miles behind it, destroying natural habitat that once was there.

but a positive environmental impact of a dam is that

a.

large amounts of electricity can be produced, without contributing to air pollution

b.

beavers won't build dams of their own

c.

it produces a lake, which is great for water skiing

d.

it makes it easier for migrating fish to make it upstream to reproduce

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.

The type of rock she find is a sediment rock

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.