Some control is lost when an experiment moves from the lab to the field. Thus, field experiments are considered quasi-experiments rather than experiments.

The three-part system of the Web consists of the _____ (or visible) Web, the _____ (or invisible) Web, and the _____ Web

Fill in the blank(s) with the appropriate word(s).

A speaker says, "Scientists who perform operations on animals in laboratories are not interested in getting scientific knowledge-they enjoy inflicting suffering on animals. Therefore, we must stop the use of animals in experiments." This speaker is guilty of using which kind of fallacy in reasoning?

A. straw man B. false cause C. either-or reasoning D. induction