Population ecology is the study of how populations ... rather than by accidental or deliberate introduction by humans. introduced species: A species that originated in a different region ...

Demographics can include any statistical factors that influence population growth or decline, but several parameters are particularly important: population size, density, age structure ...

Crowds are common in Chinese cities, as the country has a population of almost 1.5 billion In 1979, China began what remains the largest demographic experiment in history. The country’s controversial ...