How did Pasteur help to disprove spontaneous generation? He discovered that only bacteria and flies grow through spontaneous generation.
He examined covered and uncovered meat and determined that maggots come from eggs.
He determined that air was not necessary to cause meat to rot and spoil.
He showed that liquids would only grow bacteria when other bacteria were first present.

it takes hundreds of years to become stable.

if you have another question lmk.

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.