18. Which of the following is not an advantage of using biological control? A. It does not pollute the environment
C. It does not affect the health of humans
B. It upsets the natural food webs in the area
D. It is not costly

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.

Veronica and her little sister, monique, are playing on a seesaw. if veronica weighs 75 pounds, and monique weighs 60 pounds, which statement is true?

In what ways does the study of human population differ from the study of wildlife ecology