Answer:
Oil
Explanation:
Since, unlike oil, source like wind, solar, water etc. come naturally we don't and can't replace them but when the viscosity in oil has been used up it must be change to allow the proper functioning of the machine.
A. instinct.<span>Instinct is the tendency of an animal to exhibit a particular complex behavior.</span>
1. Populations changing over generations
2. Gradual change
3. Speciation
4. Natural selection
5. Common descent
The equation allows us to see the chemical formulas of the compounds involved in the process. During photosynthesis, organisms that contain chlorophyll utilize carbon dioxide (CO2) and water (H2O) in the presence of light to make glucose (C6H12O6) and oxygen (O2)
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