Our teeth bite or tear. they also chew food and break it down into smaller pieces. saliva breaks down food even further as it then travels to our esophagus. your esophagus food travel into your stomach where food is stored and broken down some more before moving into your small intestine. all of these parts working together create an important process for human survival. what is this important process called?
a) digestion
b) hibernation
c) photosynthesis
d) respiration

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .