How can we ensure everyone has clean air to breathe? (environmental science)

Which animal group is the largest and contains more species from all the other living groups combined? is it mammals or

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?

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.