A trend study is a longitudinal survey study that examines changes within a specifically identified population over time
<h3>What is
population?</h3>
The term population often refers to the number of people living in a certain place, such as a city or town, region, country, continent, or the entire world.
Global human population growth is roughly 83 million people each year, or 1.1% every year. The world's population has increased from one billion in 1800 to 7.9 billion in 2020.
A population in ecology is made up of all the creatures of a particular species that live in a specific area. For example, we could claim that one human population lives in New York City and another human population lives in Gross.
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