The need for energy, gained by respiration and photosynthesis, is the driving force of the oxygen cycle.
a. true
b. false

Which of the following are true about bacteria? select all that apply. bacteria are all around you. bacteria can or harmful. bacteria are multicellular organisms. bacteria can only be found on the human body.

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

The periodic table houses noble gas elements in group 18. these elements are highly stable and rarely react with any other elements. what is one possible reason for the stability of the noble gas elements? a. they easily form covalent bonds. b. the compounds that they form with other elements are very unstable. c. their outermost shell has the maximum number of electrons that it can hold. d. they require less activation energy.