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irina1246 [14]
3 years ago
9

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

riable? (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
Biology
1 answer:
Komok [63]3 years ago
6 0
You can carry out a test , 
1- take a sample of the air in a test tube 
2-add limewater to the test tube 
3- result : if it turns milky/cloudy it has microorganisms 
4- reason: because every microorganism respires , and so it produces Carbon dioxide . 
and limewater is the test to show the presence of Carbon dioxide . 


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