Uracil is the nitrogenous base found in RNA but not in DNA.
Answer:
Option B, It was made in stars that lived before the solar system formed.
Explanation:
Almost all the carbon that exists today with in the living organisms was produced in the stars. When these stars exploded during the big bang theory all the carbon within hem was introduced in the environment of earth some billions of years ago. Hence , though carbon introduced in earth’s environment was due to big bang, its origin is from the stars. Hence option B is the correct answer
Cyanobacteria is responsible for generation of oxygen on planet earth and thus option D is in correct.
<span>i think it is a.Molecules move against their concentration gradient. hope it helps
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Crop rotation methods in the use of legumes.
Oxygen is the answer for this question.
