What is mechanical digestion?

Btw This is worth 5 points..it would be 10 but them divided by 2 to make 5 points for 2 people. Here is the answer to your following question UvU

 Mechanical digestion requires mechanically breaking down food substances into smaller fragments to make chemical digestion more effective. The role of chemical digestion is to further degrade the molecular structure of the ingested compounds by digestive enzymes into a shape that can be absorbed into the bloodstream.

Explanation:

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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.