Which is an example of a chemical change?
(a) a burner gets red hot
(b) a teaspoon of salt dissolves
(c) a candle burns
(d) a pan of water boils

I think it may be B

Explanation:

Because salt is a chemical and since it dissolves to a liquid type. That's the change in the chemical. Solid to liquid.

Please let me know if it is right. : )

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

i think it is dna, i'm not totally sure but i think it might be.