When designing a program to decrease unwanted behavior one should establish a reinforcer that is administered when unwanted behavior is increased. T
F

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

answer; both surfaces of the membrane are nonpermeable

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project