Problem: John was studying the history of dinosaurs. He found that dinosaurs were flourishing before 66 million years ago. He labeled it as era A. Then he found that there was a mass extinction around 66 million years ago. He labeled that time period as era B. John found it interesting that many species have evolved in the course of history. Which era would more likely be shorter, era A or era B?

A: era B

Problem: Kat and Joe were into vegetable gardening. Joe started the no-till gardening method, while Kat applied conventional gardening methods. Which gardener didn't increase predator population?

A: Kat

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: Two students learned about soils in school. Brad had to study forest soils, while his colleague Frank had to study grasslands. They both did a good job and received A's for their efforts and accumulated knowledge. Which student read more about a rich diversity of animals?

A:
Brad