Which of the samples in the above table are alive? (E. Coli, Fungus, Human Skin, Maple leaf, root hair, protists, and sand/silt). How do you know?

The number of living organisms in a particular area is

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

Which is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.