I’m pretty sure it’s water, oxygen, and food. beacuse food provided both nutrients and an energy source.
Answer:
For example, addition of an orange chromic acid reagent to some compounds causes the chromium reagent to change to a blue-green color (Figure 6.37a). This is considered a "positive" test result, and in this case indicates the presence of a functional group that can be oxidized (alcohol or aldehyde).
Doctors are able to see inside your body without having to cut you open
