1 hour and 35 minutes
Small living things.
I'm not sure
They cause no diseases, they purify water, and they kill pests.
They help with making cotton, fertilizes the ground, and produce food.
They kill pests, they are in the production of foods, and help with wastewater clean-up.
Bacteria help in dairy production, Algae helps with petroleum production, and Yeast is in the production of bread.
They all help in the production of honey, Yeast is in bread production, and Fungi and bacteria help with the production of antibiotics.
Yeast and bacteria are in the production of medicines, yeast is in bread production, and they are all in the production of cough syrup.
Here's an interesting quiz for you.