<span>1. </span>CH4
(hydrocarbons) -- primary
pollutant
<span>2.
</span>NO2 (nitrogen dioxide) -- primary pollutant
<span>3. </span>O3
(Ozone) -- secondary pollutant
A primary
pollutant is an air pollutant emitted directly from a source while a secondary
pollutant is not directly emitted but forms when other pollutants (primary
pollutants) react in the atmosphere.
Inbreeding: inbreeding brings out more recessive alleles in a population, as they are more exposed and then eventually become more common.
Isolation: if a group of a species becomes isolated from another group of the species, these individuals mate with eachother and as the population of the isolated species grows, the recessive alleles will show.
Answer:
The common cold is spread in human either by direct contact with infected secretions from contaminated surfaces or by inhaling the airborne virus after individuals sneeze or cough. during night times ) can easily affect cold.
Explanation:
