How much of earth's atmosphere is made up of nitrogen and oxygen? a. between 25 and 75 percent b. 100 percent c. less than 1 percent d. close to 99 percent

The pattern of this wave changes between its beginning and end. what is true about the amplitude and wavelength of the wave when the pattern changes?

What is true of sea slugs in these orders

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously