• Avg. winter temperatures: -120°C • Gravity: 1 m/s2
• Avg. summer temperatures: -100°C
• Atmosphere? No
A. Could water exist on this planet? (2 points)
B. Why can or can't water exist? (3 points)

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots