The nitrogen, oxygen, and other gases surrounding Earth A. are pulled toward Earth by gravity
B. are found mainly near the outer edge of the atmosphere
C. exert pressure only at sea level
D. exert pressure that works against atmospheric pressure

Which of the following matches the organisms described with the correct domain? a. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycanb. archaea--multicellular, eukaryotic organisms that do not have cell wallsc. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sourcesd. bacteria--unicellular, eukaryotic organisms that always lack cell walls

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

What percentage of light hits earth's surface directly?