Question

PLEASE HELP
You must design a valid experiment to show that there are microorganisms in the air. What would be your dependent variable? (Points : 2)
sterilized broth
growth of organisms in the broth
exposure to microorganisms in the air
You must design a valid experiment to show that there are microorganisms in the air. What would be your control group? (Points : 2)
open flask with unsterilized broth
open flask with sterilized broth
sealed flask with unsterilized broth
sealed flask with sterilized broth

Answer 1

@hick4life

Answer 2

@_fluffeh_

Answer 3

@sugarplum15

Answer 4

1st, B.
2nd, B
Hope it helped.

Answer 5

2nd d