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You must design a valid experiment to show that there are microorganisms in the air. What would be your dependent variable?

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?

open flask with unsterilized broth

open flask with sterilized broth

sealed flask with unsterilized broth

sealed flask with sterilized broth

Verified Answer :

scme1702

We are checking to see if microorganisms are in the air so we will keep exposure to air as the dependent variable.

A sealed flask with sterilized flask, so it is not exposed to air and it does not have any pre-existing microorganisms.

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