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

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.

is this a question? wassup

answer australia and antarctica;