Before conditioning occurs, a dog does not salivate to the sound of a ringing bell. at this point, the ringing bell is:

24-karat gold is considered to be pure gold. 18-karat gold is considered to be about 75% gold. what is 18-karat gold considered a mixture rather than a pure substance? a) it has a variable composition of other elements and minerals. b) its color is different than pure gold. c) the gold atoms are not arranged in a repeating pattern. d) it can be melted and transformed into a different substance.

During the late 19th century, russia's settlement and development of siberia was made possible by the invention of the

Which of the following statements about new spain is true