Problem: Two friends named Jill and Jane met after many years and had a chat over a cup of tea. Jane was 70 years-old, while Jill was 55. They shared many stories. Which friend had a greater chance of developing Alzheimer's disease?

A: Jane

Problem: High lake had a lot of fresh and salt water mixing, therefore presented layers of stratified water.The water was poor in nutrients.Low lake had no such problems and it was a very abundant and prolific fishing spot. Which lake had less phytoplankton?

A: High

Problem: The doctors used used the newly discovered allergy medicine on two groups of people. As a result, group Alpha experienced mild allergy symptoms, while group Beta continued experiencing severe allergy symptoms and remained hospitalized requiring additional treatment. Which group had some people that might have required an epinephrine injection?

A: group Beta

Problem: Iceland and Ireland both used agriculture as a the main component of their economies. Ireland used lots of fertilizer and had big environmental problems as a result. Iceland does a lot of greenhouse agriculture using geothermal energy, so it is more protective towards the environment. Which country caused more decomposers to break down dead algae?

A:
Ireland