Which of the following statements about the earth’s atmosphere is true? a. in the past few decades, carbon dioxide levels have been rising. b. in the past few decades, carbon dioxide levels have been falling. c. a recent increase in carbon dioxide levels can contribute to a long-term cooling of earth’s climate. d. a recent decrease in carbon dioxide levels will increase plant growth on earth.

Explain why scientists use shared characteristics to make cladograms.

Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1