Star a has a magnitude of 2. star b has a magnitude of 5. what is the brightness ratio? a. 6.3 : 1 b. 15.8 : 1 c. 5 : 2 d. 2 : 5

Pixels are often referred to using dpi, or dots per inch. true\false

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

Which of the following is the best definition for the process of photosynthesis? a.) plants digest sugars to make energy. b.) plants use oxygen and glucose to make carbon dioxide. c.) plants use sunlight and carbon dioxide to make sugars. d.) plants use sunlight to make chlorophyll and chloroplasts.