- Oxygen cycle is the cycle which maintains the level of oxygen in the atmosphere.
- Oxygen from the atmosphere is used up during combustion, respiration and in the formation of oxides of nitrogen.
- This oxygen is returned to the atmosphere by lithosphere.
- This forms the oxygen cycle in nature.
Hope you could get an idea from here.
Doubt clarification - use comment section.
Anthropoid
Pretty sure that is right B/C they have a exoskeleton, they are land animals primarily (Oxygen Tubes), they have joints and have two body segments.
Answer:
he human body contains many salts, of which sodium chloride is the major one, making up around 0.4 per cent of the body's weight at a concentration pretty well equivalent to that in seawater.
Explanation:
They obtain energy by consuming other organisms.
Answer:
The population is increasing exponentially. each year there are 2.5% more people than the last.
