A pure substance is just one element, or one or elements that is bonded to another. Which of these is NOT a pure substance gold- it's an element

oxygen-it's an element

carbon dioxide -it's a compound

koolaid- it's dissolved

Sorry for the late answer, I got carried away.

Koolaid is the substance that is not pure.

Explanation:

Koolaid contains water, sugar & coloring, but is not a pure substance because each of the ingredients can differ each time it is made. it is the same throughout and can be separated, therefore it is also a homogeneous mixture.

answer: c

explanation:

the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.