Coronary heart disease is caused by:

reduced blood flow to the heart
reduced nutrient flow to the heart
reduced oxygen flow to the heart
reduced electrical flow to the heart

The correct answer is reduced oxygen flow to the heart.

Explanation:

Coronary heart disease brings various complications such as acute myocardial infarction, arrhythmias, angina pectoris. The cause of this disease is atherosclerosis caused by the formation of atheroma plaque (formed by cholesterol, fatty acids, calcium, fibrin) in the arteries that supply the heart. The accumulation of this hard plate in these blood vessels, decreases the blood flow leading to the least amount of oxygen that reaches the heart, and can generate a heart attack.

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.