True/false: the mud and muck at the very bottom of any body of water called the aphotic zone

According to the online content activity for this lesson, what should you do if you do not understand the material you are trying to learn? a. try a new approach to learning the material. c. re-read the material b. give up d. find someone to give you the answers to the test select the best answer from the choices provided a b c d

If the limit, as x approaches infinity (or negative infinity) of a function is equal to a, we say that the line y = a is a of the function f.

Why is it essential to operationally define the variables in a study?