Answer:
We breathe in air which has a higher concentration of oxygen than carbon dioxide and we breathe out air with a higher concentration of carbon dioxide. Both the gases are present in the inhaled and the exhaled air.
What do you need help with?
The total number of unemployed people is the statistic.
Explanation:
The number of unemployed people is defined by the number of people who do not have a job but are actively seeking employment.
This also has a filter on the total population against the age limit below which it is not legally permissible to work.
So, considering all these filters have been met in the description of the statistic mentioned in the question it is easy to assume that this statistic is about the total number of people who are unemployed in an area or a country.
The answer is carry-over effects
Explanation: Carry-Over Effects is an effect that "transports" from one experimental condition to another. Whenever subjects perform in more than one condition (which occurs in projects within the subject), there is the possibility of transition effects. For example, consider an experiment on the effect of presentation rate on memory.