On a certain math test, together Al, Bill and Cindy have an average score of 20. On the same test, Al, Bill, Cindy and Dave average a 21. What score did Dave get? (A) 20
(B) 21
(C) 22
(D) 23
(E) 24

Which scenario describes intraspecific, indirect competition? a. a peacock defends its territory against another peacock. b. lions and hyenas compete for the same prey animals. c. a male black bear eats fish in an area of a lake, so other black bears can’t. d. different species of birds fight over spilled popcorn on the ground.