Which is a tool used by scientists to determine the composition of objects?

a. a hologram
b. a spectrometer
c. a wave front
d. a prism

Two friends are having a conversation. anna says a satellite in orbit is in freefall because the satellite keeps falling toward earth. tom says a satellite in orbit is not in freefall because the acceleration due to gravity is not 9.80 m/2 . who do you agree with and why?

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?