Which gases each make up less than 1 percent of earth's atmosphere? check all that apply.
argon
oxygen
nitrogen
water vapor
carbon dioxide

Creating new things to solve problems and improve life depends on the close interaction of which two fields?

During photosynthesis, hydrogen ions are most directly used to in the chloroplast pictured above. a) make glucose b) make chlorophyll c) produce carbon dioxide d) drive the production of atp

Which of the following is a feature of all cells? o a. all cells have a nucleus. o b. all cells have dna for at least part of their life cycle. het . o c. all cells are spheres. o d. all cells have a rigid cell wall.