Respuesta :

leanarocks
The best answer is B. Single-celled organisms contain structures that function in maintaining homeostasis
nathavargasj

Answer:

The correct answer is A. all single-celled organisms contain contractile vacuoles, a flagellum and chloroplasts.

Explanation:

Is not B because the flagellum doesn't maintain homeostasis, and is not C or D because those are characteristics of single-celled organisms.