All life forms on earth are located in the a. atmosphere b. geosphere c. biosphere d. hydrosphere

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.

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient