Asolid element or compound that is found in nature

It is important to wear proper protective equipment in lab even when not actively performing experiments because accidents can affect any researcher, even one not working on an experiment. select the best answer from the choices provided

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal