Which of the following components serves as both a cover for the bottom of the engine block and a reservoir for engine oil? a. front cover b. valve cover c. oil pan d. lubrication retainer

Critics claim that the biological theory of personality may be problematic for research due to which of the following? a. there is already too much theoretical work concerning biological influences on personality. b. biological influences on personality are impossible to scientifically research. c. the biological theory provides little structure to direct or guide research. d. biological theorists have had difficulty establishing supportive research for the biological perspective.