Problem: Greg is studying the environmental impact of agriculture. He noticed that in his own state a lake near agricultural lands has been declared as a dead zone. For his study Greg labeled this zone as zone A. Then he found near a national park in his state a lake is not declared as a dead zone. To further his study he labeled this zone as zone B. Would zone A have less or more oxygen than zone B?

A: less

Problem: Sandra liked all creatures but loved to study frogs. Her sister Julie studied more about fish and butterflies. They both loved nature. Which sister heard fewer male frogs "ribbiting"?

A: Julie

Problem: Two students had to study fermentation processes for a school project. Ned studied lactic fermentation, while Kat studied alcoholic fermentation. Which student read more about bacteria carrying out lactic acid fermentation?

A: Ned

Problem: Two counties were part of the same region. Green county used alternative methods to produce energy, while Brown county used fossil fuels and released a lot of carbon dioxide into the atmosphere. Which county generated more anthropogenic emissions?

A:
Brown