A(n) _______________ is a consistent difference between levels of a factor

Francis was dismayed to discover that some of his football team mates where using drugs to enhance there footwork and endurance on the playing field. Which of the following drugs were the players most likely using?

A) morphine derivatives B) marijuana C) amphetamines D) barbiturates

Which animal psychologist was the first to suggest that humans have an innate caretaking and nurturing mechanism that is triggered by the features of a baby's face?

a) Martin Seligman b) Gregor Mendel c) Konrad Lorenz d) Charles Darwin