The nearest star to Earth is .
A. Rigel
B. the Sun
C. Betelgeuse
D. Proxima Centauri

Which of the following is an example of a non-falsifiable hypothesis? a. there is a teacup orbiting the milky way galaxy. b. there is no life on mars. c. the human species started in africa. d. humans cannot live without the amino acid methionine

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen