In adult humans, most cancers are carcinomas or adenocarcinomas. These include cancers of the skin, lung, colon, breast, and prostate. Which of the four basic tissue types is involved, and why?

The correct answer is: Epithelial tissue, because 1) it's in direct contact with the environment, and 2) their cells are rapidly dividing. The two factors contribute greatly to the appearance of cancer.

Explanation:

Epithelial tissue is one of the four basic tissue types (along with connective tissue, muscle tissue, and nervous tissue), and it is characterized for being avascular (there are no blood vessels in it), being very cellular (it has many cells and not many fibers), having polarity, being capable of regeneration, and being attached to a basal membrane.

The main function of the epithelial tissue can vary from the location of it, since it gives each organ a function, but as a whole, we could say it is involved in transport, secretion, protection, sensing, and absorption.

While the epithelial tissue's characteristics (such as their rapid regeneration) are crucial for its highly important functions, this can also make them home to carcinomas and adenocarcinomas.

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.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.