Domestication of corn involves selection of a few highly desired traits within a species to produce fast-growing varieties. Explain what the long-term danger of this practice has on worldwide corn production over time.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

give me abc and i will get it for u.