Is this investigation a controlled experiment or an observational study? Explain your answer.

Matt is driving down 7th street. he drives 150 meters in 18 seconds. assuming he does not speed up or slow down, what is his speed?

In the 1980's, congress authorized the u.s. department of energy to build the wipp facility in the chicuahuan desert in new mexico. what is the purpose of wipp?

Which of the following is not am example of a polymer? protein nylon kevlar concreta