Random question?

One cause of heat in a car engine is caused by friction between parts. Which of these reduces the amount of heat produced by friction?

Random question?

Which distance is the smallest for which it is most practical to use the light-year as a unit of measurement?

Random question?

What is the complementary base of adenine in DNA?

Random question?
Some butterflies live an average of two weeks. This period of time is called a life