Which organelle in the cell is often called the "powerhouse"?
a. lysosome
b. chloroplast
c. mitochondrion
d. nucleus

Rue or false siblings look simila rbecause they each have some traits of their parents.

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.

Which are characteristics of flukes? check all that apply. a they are free living. b they are a type of flatworm. c they reproduce sexually. d they have eyespots. e they are segmented.