How do algae help keep the balance of an aquatic ecosystem? Select all that apply. 1.by releasing oxygen
2.by providing food for consumers
3.by absorbing carbon dioxide
4. by releasing carbon dioxide

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.