12.  The smallest change in stimulation that can be detected 50 percent of the time is called the absolute threshold.

19.  Chemical substances that change moods and perceptions are called ______ drugs.

According to the late policy, 20% will be deducted for late assignments. 

16.  Smell is often considered the “dispensable” sense, the one we could most easily live without if necessary.

13.  For humans, the ability to ______ is probably the most important sense.

What is the efficiency of a typical photovoltaic solar cell in converting sunlight into electricity?

What is the potential environmental impact of widespread deployment of energy storage technologies, such as large-scale lithium-ion batteries?

Which gas is commonly associated with “cow burps” and is a potent greenhouse gas contributing to global warming?

Which of the following is a major challenge in the widespread adoption of electric vehicles to combat climate change?

What is the primary greenhouse gas responsible for trapping the highest amount of heat in the Earth’s atmosphere?