Problem: John has been hearing about climate change for last couple of years. He wants to understand the science behind climate change. For that, he picked up two eras in earth's history, era A and era B. Era A was hundred thousand years ago, and era B is in the present day. He now wants to compare these to eras to understand the change in climate better. Which era would have less autotrophic organisms, era A or era B?

A: era B

Problem: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her. Which sister didn't have a disease caused by random errors in genes?

A: Beth

Problem: Ted had two garden plots. The Eastern plot had very healthy plants and good soil. The Western plot was problematic, the plants were attacked by parasitic fungi. Which plot had fewer fungi disable the sexual reproduction of the plants?

A: Eastern

Problem: Two neighboring countries had health epidemics. While Ghana had a measles problem, Niger had a very serious HIV problem that seemed to get out of control. Which country had more people transmitting HIV through sexual contact?

A:
Niger