Apuffy white cloud with a flat bottom

a. cumulus

b. fog

c. stratus

d. cumulonimbus

The correct answer is Cumulus.

These clouds look puffy and is flat in bottom. They look like cauliflower and  are white colored too.

These forms of clouds floats in the sky and seems to be like floating cotton. They are located at 3300 feet above the ground.

They always grow in upward direction and can sometimes form giant structures which are known a the giant cumulonimbus which is responsible for thunderstorms.

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.