Some synthetic substances are exactly the same as substances found in nature. why would scientists synthesize something that already exists? hint: you tube video, “professor dave explains: will synthetic vitamins make me explode

How is the gravitational force related to the distance between two objects?

Which of these statements is true? a. quarks pair with leptons to form protons and neutrons. b. quarks pair with bosons to form photons. c. quarks pair with photons to form protons and neutrons. d. quarks pair with other quarks to form protons and neutrons. e. quarks pair with electrons to form protons.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects