Which of the following can be determined by studying the spectrum of a star?

the chemicals in the atmosphere of the star
the motion of the star
the temperature of the atmosphere of the star
all of the above

Edward tolman explained the results of his study by theorizing that the rats were learning about the maze during every trial but they a. were agitated because other groups were getting reinforcement b. could not remember how to demonstrate it without reinforcement c. were not motivated to demonstrate it without reinforcement d. seemed to be too lazy to actually work without reinforcement

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?