Paul could reach all the switches because they were originally installed at the right height of him.

A. Getting off to work with a minimum effort helps save one’s energy.
B. Dr. Kleiman explains why people reach their peaks at different hours of a day.
C. Habit helps a person adapt to his own energy cycle.
D. Children have energy cycles, too.

A. Pesticides can cause an amphibian’s skin to dry out.
B. Pesticides kill the insects that amphibians depend on for food.
C. Dissolved pesticides can easily enter amphibian’s bodies.
D. Amphibians may eat plants that have been treated with pesticides.