The right options are;
-They’re made up of more than one substance.
-They’re readily available in nature.
Composite materials are materials that are produced by combining two or more substances that has different properties. Composite materials have unique properties that are different from the individual constituents and the constituents can be easily differentiated within the composite materials because they do not blend into each other. Some composite materials are readily available in nature. For example wood is a composite material that is composed of cellulose and lignin.
Synthetic organic pigments are derived from coal tars and other petrochemicals. Inorganic pigments are made by relatively simple chemical reactions—notably oxidation—or are found naturally as earths. Inorganic pigments include white opaque pigments used to provide opacity and to lighten other colours.
Not sure but I would say that we can’t put out the fires just yet in the park because the smoke would be really bad to breathe in and as for the desert, since no one is really there it wouldn’t kill anymore
The answer is C.
: Hope this helps :)