Answer:
population density
Explanation:
Because many people travel from rural areas to urban areas in search of greener pastures therefore making the population rise
Lol maybe I might know it
Answer: Autism
Explanation: According to the DSM V, symptoms related to language, social skills, intellectual abilities and interests from high to low functioning fell under the autism cathegory.
Autism is considered as a neurodevelopment disorder in which there is a primarly social inability that difficults interactions with other people; this also is usually presented with different IQs and language disorders.
Answer:
Nitrogen compounds mixed with hydrogen