Dna is different from rna in that
a. rna is made up five bases, whereas dna is made up of four.
b. in general, rna molecules are longer than dna molecules.
c. rna contains an additional oxygen atom on the ribose sugar.
d. rna cannot exist as a double helix. all of these statements are true.

RNA contains an additional oxygen atom on the ribose sugar. (Ans. C)

Explanation:

RNA contains a sugar which is known as ribose, and which contains an extra group of hydroxyl (OH-) while DNA contains deoxyribose sugar.

RNA contains four nitrogenous bases cytosine, adenine, guanine, and uracil, while DNA contains cytosine, adenine, guanine, and thymine.

Double helix means two stranded structure like DNA, while RNA is single stranded.

DNA molecule is much longer polymer than RNA molecule.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion

the index of refraction of the second medium is higher. i just took the test trust me !