Which contribution to the body of scientific knowledge is most recent? the development of the lever
the discovery of the structure of DNA
the discovery
of electricity
the theory of evolution

What is a difference between a mixture of elements and a mixture of compounds

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures

Temperature is defined as a. the equivalent of heat. b. a measure of the average kinetic energy of the individual atoms or molecules composing a substance. c. how hot or cold it is. d. the total kinetic energy of the atoms or molecules composing a substance. e. none of the above is correct.