Does Mars has Oxygen? Can we breath on Mars?​

There is Oxygen in Mars comprising the 0.13% of it's atmosphere. With that, it is still impossible for humans to breathe on the said planet without suits with oxygen supply.

yes

Explanation:

Mars atmosphere is dominated by carbon dioxide (CO2) at a concentrated of 96%. Oxygen is only 0.13%.

/the trachea, commonly known as the windpipe

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.