burninh fossil fuels is not an example
It's called a compound because different elements are held together by a chemical bond.
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International Union of Pure and Applied Chemistry
From the diagram, structure 1 would be the chloroplast and it represents the site of photosynthesis.
<h3>Plant cells</h3>
The image (see attached) is that of a plant cell and structure labeled 1 is the chloroplast.
The chloroplast of plant cells acts as the site of photosynthesis where inorganic materials are used to synthesize carbohydrates.
Plants generally serve as producers in food chains and thus, chloroplast helps sustain life.
More on plant cells can be found here: brainly.com/question/1894299