Glen is attempting to use operant conditioning to train his dog, thor, to fetch a ball upon command. to test thor’s understanding, glen throws the ball and yells, “pineapple! ” thor does not fetch the ball. which process of operant conditioning has thor demonstrated?

There are six elements that make up most of the human body. which of the following is not one of these six elements?

What part of the body contains bile, an enzyme that break down lipids?

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical? a. some people consider embryos to possess rights equal to those of fully developed human beings. b. extracting stem cells from embryos is a very energy-intensive process, which consumes resources that could be used elsewhere. c. embryos are difficult to obtain, so the monetary cost of using them for research outweighs their benefit. d. the process of extracting stem cells from embryos generates biohazardous waste that cannot be safely disposed of.