Which of the following types of research is conducted on multiple occasions over time?

Ahypothesis is? close agreement by competent observers of observations of the same phenomena. a guess that has been tested over and over again and always found to be true. an educated guess that has yet to be proven by experiment. the long side of a right triangle. a synthesis of a large collection of information that includes guesses.

The necleus of an atom is made up of what subatomic particles?

In science and physics what is the standard unit of measure for speed?