Describe two negative ways that the animals living in the area have been affected by the changes shown in the diagram.

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

What is the main reason that attitudes are more often revealed in spoken rather than written language? a. in writing, we try to put the "best face" on what we write. b. we speak far more often than we write. c. in writing, we can more easily conceal our attitudes. d. in spoken language, we are often careless in our use of words.

Which of the following requires the use of energy and the of transport proteins to move a molecule across a cell membrane?