The ozone layer is part of the a. stratosphere b. thermosphere c. mesosphere d. troposphere

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic

Which of the following happened during the precambrian era? the first prokaryotic cells the first eukaryotic cells development of photosynthesis all of the above

What is the goal of cellular respiration