To an observer on a ship at sea at which latitude does the north star appear closest to the horizonn

0 ° latitude,  at the equator

Explanation:

Given the Earth's spherical shape, the North Star, Polaris can be observed relative to the horizon. Its position is dependent on the observer's location;  so, the angle between Polaris and the northern horizon corresponds with latitude.

Latitude is a point's coordinate relative to its location in a north-south position. As an observer on a ship, the North Star, would appear closest to the horizon when viewed at the equator, thus, since the angle between the northern horizon and Polaris is approximately zero, the coordinate is 0° latitude.

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.