1- how can prokaryotes be used by humans/professionals? 2- how can eukaryotes be used by humans/professionals?
3- how can digestive system be used by professionals?

1 Fermentation processes, such as brewing, baking, and cheese and butter manufacturing. Chemical manufacturing, such as the production of ethanol, acetone, organic acids, enzymes, and perfumes. Pharmaceuticals, such as the manufacture of antibiotics, vaccines, and steroids. Energy, in the form of biogas (methane)

2 Despite the fact that we have gobs of prokaryotic cells living inside and on us, humans are still categorically eukaryotic organisms. This means that all human cells—including those found in the brain, the heart, the muscles, and so on—are also eukaryotic.

3 Digestion works by moving food through the GI tract. Digestion begins in the mouth with chewing and ends in the small intestine. As food passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules.

Explanation:

weathering is the answer.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.