Answer: b. Nitrogen; Oxygen
Explanation:
The air is a mixture of gases in the following percentage;
Nitrogen; 78%
Oxygen : 21%
Carbon(IV)Oxide : 0.03%
Argon : 0.9%
Others ( minute traces of Neon, Helium, Methane e.t.c) : 0.17%
Answer:
destructive force breaks down features of earth's surface/ constructive forces build up features of earth's surface
Continuous feeders are aquatic animals that constantly feed by having water filled with food particles (for example, small plankton or fish) entering through the mouth. In addition, they do not need a storage area, such as a stomach, for food. Now Discontinuous feeders must hunt for food on a regular basis; they need a storage area, such as a stomach, to house food until it is digested.
