What substance was responsible for a major ozone depletion in the 1900s?

Which of the following is the best illustration of the difference between metabolism and digestion? A) Digestion has a wide variety of chemical reactions while metabolism is restricted to only a few reaction types.

Which of the following refers to an organism s ability to maintain constant conditions within its body? A. Metabolism B. Homeostasis C. Stimuli D. Sexuality

Which of the following is NOT true about radio telescopes? * O Must be large because radio wavelengths are long. O May be placed in valleys. o collects visible light O Most have curved, reflecting surfaces.

Biology is the study of a. life. b. plants. c. animals. d. the physical world.

25. The variable that is being measured in the experiment is called the

Which manufactured fiber is made from coal or petroleum, often blended with other fibers, and as great washing ability?

What is the menstrual cycle and how long does it last?

Six fingered offspring are formed from normal fingered parents. why?

What does the red-shift of galaxies indicate? A. The galaxies are not moving. B. The galaxies are shrinking. C. The galaxies are moving toward each other. D. The galaxies are moving away from each other.

Which scientist contributed to our understanding of infectious disease