All substances have characteristic properties. if one of these properties can be observed without changing the identity of the substance, it must be a:
( explain! )

universal property

physical property

biological property

chemical property

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Which change to the system wood cause the freely-moving piston to lower?

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.