What two structures would provide a positive identification of a plant cell under a microscope? a)cell wall, mitochondria b)plasma membrane, large central vacuole c)ribosomes, chloroplasts d)cell wall, chloroplast

Cell wall, Large central vacuole, Chloroplasts

The correct answer is option D which is cell wall, chloroplast.

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.

the answer would be a