You look at a cell under a microscope and note it is boxy, with a rigid wall. The cell could: A.
Have come from a dead rat

B.
Be a single-celled bacteria

C.
Have come from a blade of grass

D.
Have come from a human

C

Explanation:

In a plant cell you will see a structure called the cell wall which is a rigid covering that protects the cell and provides some support to shape it. There are plant cells in a blade of grass because it is a plant so therefore C is the correct answer.

the answer to your question is:

strong-mayor system

c. the passage of the fifteenth amendment