Question: 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. Did era A have higher or lower brith rate than era B?
Answer: lower

Question: Tom and Jerry are two friends who have always had competitions with one another throughout their whole lives. Yesterday, they just finished their most unique competition so far. Each man was given a room to sit in that had several highly radioactive objects in it. The challenge was to see who would stay in the chamber longer. Tom didn't stay in his room for very long, but Jerry felt determined to win and stayed in his chamber almost the entire day. Who is more likely to need a liver transplant?
Answer: Jerry

Question: Two six graders learned about the lives of animals. Lori learned more about fish, while Dan learned more about mammals. Which student learned more about tiny, sac-like structures?
Answer:
Dan