How can’t scientists use fossils in rock layers as evidence that one event happened earlier than another event?

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.

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron