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Describe the difference between primary and secondary succession.

Primary succession is the colonizing of a new environment that lacks organisms and plant life.

In secondary succession, an area previously occupied by living things is disrupted then recolonized following the disturbance

Explanation:

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.