Final answer:
The amount of advertising in a magazine varies, but for a DNA molecule with 30% adenine, there would also be 30% thymine due to complementary base pairing.The correct answer is approximately option c.
Step-by-step explanation:
The question regarding how much advertising copy the average magazine contains does not have a universal answer as it varies widely across different magazines and their types. However, based on a generic understanding of magazines and their content, it is reasonable to predict that options B, C, and D could all be likely scenarios depending on the magazine.
For example, fashion magazines are often filled with a high percentage of advertisements, whereas a trade or specialty magazine might have less. To determine the exact answer, one would need specific data from a study or survey of various magazine types and their content.
Regarding questions (d) and (e) about advertising footwear, without additional context or information about the magazines in question, it is impossible to predict how many pages will advertise footwear or if all 20 will feature such advertisements.
As for the percentage of thymine in DNA, based on the rule of complementary base pairing in DNA, if 30% of the bases are adenine, then 30% must also be thymine as adenine pairs with thymine in equal proportions. Therefore, the correct answer would be C. 30%.