Research by Olds and Milner discovered that the activity of neurons plays a particularly important role in reinforcement.

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.

Which of the following was not a part of the armistice between germany and the allies? a. germany had to agree to the terms of the treaty of brest-litovsk. b. germany had to surrender its entire submarine fleet to the allies. c. kaiser wilhelm ii had to give his throne. d. all german troops had to be withdrawn from the western front.

What is affirmative action as a social program intended to accomplish? do you think it has been successful? what are some specific examples that you can offer to support your answer? this is for my multicultural studies class i need asap !