Which of the statements would BEST serve as a topic sentence for a paragraph?

A) Walt Whitman changed the way Americans thought of poetry.
Eliminate
B) Robert Frost composed many poems, including Mending Wall.
C) Ralph Waldo Emerson often walked in the woods surrounding Walden Pond.
D) Benjamin Franklin ran away from home because his brother was cruel to him.

A)Walt Whitman changed the way Americans thought of poetry.

Eliminate

Explanation:

Your topic sentence needs to be broad and each sentence of the paragraph should get more and more specific. Kind of like an upside down triangle.

( I'm in high school taking college courses and  learned this from my college professor so I am very confident in this answer)

the answer is "a.) well–developed vascular system."

explanation:

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.