Hannah wants to measure the length of time it takes for a mouse's heart to beat fifty times. Which of the following tools would be the most useful for this investigation?

A.

stopwatch

B.

thermometer

C.

ruler

D.

balance

A researcher becomes aware that the judges he is using to make observations are becoming more proficient at their task. This improvement among the judges might suggest a potential threat to the internal validity of the study.

Between ages 7 and 11, children can think in sophisticated ways as long as what they are thinking about is tangibly represented. piaget calls this stage

Sensitivity training emphasizes changing behavior through structured group interaction. a. True b. False

What does conquistadors mean

Housing and entertainment are both needs. True False

A rectangular athletic field is twice as long as it is wide. If the perimeter of the athletic field is 90 yards, what are its dimensions?

Who were the California's

Which sentence best describes the narrator's purpose in writing this proposal? A. He is proposing a solution to the problem of English landlords unfair treatment of Irish tenants. B.

Dr. macmillan has designed a test to measure mathematical ability in college graduates. in order to establish a norm against which individual scores may be interpreted and compared, she is presently administering the test to a large representative

What geographic factors influenced Mesopotamia civilizations development