Which of the following gases was most likely present in earth's earliest atmosphere? a) nitrogen b) hydrogen c) argon d) oxygen

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.

When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?

During photosynthesis, hydrogen ions are most directly used to in the chloroplast pictured above. a) make glucose b) make chlorophyll c) produce carbon dioxide d) drive the production of atp