Problem: Mike was reading about climate change. The author compared two different time periods, era A and era B. Era A was set in the present day. But era B was set in the year 2040. Mike was surprised to find how Arctic area would change in the coming years. Would era A see less or more ice in the Arctic than era B?

A: more

Problem: Two old friends were both oceanographers. They were both researching the levels of marine pollution in Earth's oceans. Vic studied the Arctic Ocean, while Dan studied the Pacific Ocean. Which friend observed more chemicals which were polluting the ocean?

A: Dan

Problem: Students studied two groups of organisms. Group A composed of organisms that reproduce sexually, and group B composed of organisms that reproduce asexually. They were fascinated by their discoveries. Which group of organisms does not receive a mix of traits from both parents?

A: group B

Problem: A doctor tested two people for HIV. Tom had the virus in his blood, while Nick didn't have HIV, he was healthy. Tom has apparently had the virus for 20 years. Which person developed frequent infections?

A:
Tom