Alist of environmental issues is shown below.
• rabbits transported from europe overrun and
deplete farmlands in australia.
• many areas in the southeastern united states
are overgrown with the kudzu plant from asia.
• in parts of new york state, bluebirds must
compete with starlings originally brought here
from england.
all of these issues are the result of
(1) introduction of nonnative species into stable
ecosystems
(2) genetic engineering without using adequate
safety precautions
(3) preservation of habitats due to human
population growth
(4) use of foreign species to replace native
predators

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.

i think this picture will you.