Problem: Bob works as a scientist for a large fishing company in Norway. Norway's government has strict regulations on fishing to protect its fish stock. Part of Bob's job is to provide the government with fish mortality data. Today, he has two samples of fish to investigate, sample A and sample B. Bob concluded sample A had natural mortality, but sample B had fishing mortality. On which fish fishing gear was not used, sample A or sample B?

A: sample A

Problem: Bob is a biologist. Today, he has four samples of organisms to test, sample A, sample B, sample C, and sample D. He induced higher respiration rate in sample A. Then he induced no respiration rate in sample B. Next, he classified sample C as heterotrophic and sample D as autotrophic. In which organism ATP molecules would be produced, sample A or sample B?

A: sample A

Problem: David was studying human history. He selected two specific eras of human history, era A and era B. Era A was before humans had invented agriculture. And, era B was after the invention of agriculture. He noticed that human societies had changed dramatically after the invention of agriculture. In which era food supply was more dependable, era A or era B?

A: era B

Problem: Pam and Jill studied mammals. Jill was fascinated with their nutrition, while Pam was more interested and read about the natural selection phenomenon. Which person studied more about organisms with traits that better enable them to adapt to their environment?

A:
Pam