Problem: There are two planets, Glarnak and Bornak, that share the same atmospheric composition. The planets have nearly identical ecosystems and topography. The main difference between the two planets is the level of global warming on each planet. Glarnak is experiencing a strong impact from global warming. Bornak, though, is experiencing practically no effects of global warming. Which planet probably produces more carbon dioxide?

A: Glarnak

Problem: Two neighboring towns had different methods of growing crops. Lean town used insecticides, while Bean town did not. Lean town had high levels of air pollution. Which town had more inhabitants experiencing eye problems?

A: Lean

Problem: In a greenhouse, a botanist has just finished planting two of the same kind of plant. Plant A was placed in a pot of standard soil, and plant B was planted in some serpentine soil. The botanist is planning on taking care of both plants equally so he can see which type of soil is better for growing a plant. Which plant will experience less abiotic stress?

A: Plant A

Problem: Mary had two children. Her firs born was named Bill and was normal, and her second child was named Sam and had Down syndrome. Which child had a degree of mental retardation?

A:
Sam