The way these nucleotides (more specifically, the bases of each nucleotide) pair together is called complementary base pairing. This means that each base only pairs with one other base If one strand of DNA had the following nucleotide sequence - GCATTAG, what would the other strand be based on the rules of complementary base pairing?
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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.

put the answers   and i could answer.

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

the answer would be a