Think of the human brain for a moment. It is an incredibly complex mechanism. It consists of a range of structures, including hemispheres, lobes, and even layers. Each structure is comprised of various types of cells, including nerve cells, blood cells, and cells that make up blood vessels. Where do you think all these cells came from? Consider what you know about mitosis and meiosis. Have the cells that make up your brain existed since fertilization? If so, how does human growth occur? If not, can you trace their origins back to fertilization?

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.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

hope it ,

bioteacher101