In the United States, the general and expected style for a group leader is

The type of evidence used as backing in the argument stated above is

(a) an example. (b) a premise. (c) an opinion. (d) a scientific report.

What must you do to permit less light to pass through the lens?

a. change to a higher ƒ-stop number b. change to a lower ƒ-stop number c. open the iris d. increase the focal length of the lens e. increase the aperture