The absolute threshold is the level at which someone can detect a stimulus percent of the time.
a) 25
b) 50
c) 75
d) 100

Which of the following types of stars had the smallest initial mass? which of the following types of stars had the smallest initial mass?

Receiving 24 points on your license within a 36-month period will cause your license to be suspended for a. 30 days b. three months c. six months d. one year

Which fossil fuel releases the least amount of carbon dioxide in a year a.natural gas b.coal c.nuclear energy d.oil