What is the collective role of water vapor, carbon dioxide, ozone, and methane in the atmosphere?

a) they prevent the harmful ultraviolet radiation of the sun from reaching earth.
b) they are important components of the water cycle, which regulates earth's temperature.
c) they regulate earth's climate by trapping heat and holding it within earth's atmosphere.
d) they scatter almost a third of the sunlight that reaches the outer layers of the atmosphere back into space.

The correct answer is A) and C).

Water vapor, carbon dioxide, ozone, and methane are the essential greenhouse gases. They prevent the harmful ultraviolet radiation of the sun from reaching the earth. This is because they trap the heat energy and hold it within atmosphere. Due to this, they help in the regulation of the earth's climate.

Thus, the correct answer is-  A)  They prevent the harmful ultraviolet radiation of the Sun from reaching Earth.

C) They regulate Earth's climate by trapping heat and holding it within Earth's atmosphere.

d. the weight of the book

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.