Population and population growth

Population : The amount of individuals of a species that live in a certain limited area.

Population growth : The population size is never constant and changes regularly .When the population size changes its called population growth.

Natural selection:

There are certain factors that hinder the population from becoming too big. These factors can be water, food, natural enemies, sicknesses, or a shelter. When the population exceeds its maximum capacity, there wont be enough food and water for everyone. We can also call this "the survival of the fittest" or natural selection. Natural selection is the reason for evolution.

Growth curves:

To show the number of individuals in a population and how that number grows you can create a line graph, where the x-axis represents the time (in months/years) and the y-axis represents the number of individuals.

We can divide these growth curves into three main groups:

- Controlled Growth, which is an S-Formed growth curve.

- Uncontrolled Growth, a J-Formed growth curve.

-Cyclical Growth, A curvy graph.

World population growth:

When we talk about the humans population, growth, the graph may be different. It looks more like an exponential graph. Right now the human population growth on earth is having a drastic increase, but soon the earth will hit its maximum capacity. The UN expects that there will be 9.6 billion humans in 2050, and the curve will become more flat around 2100 when there is about 11 billion people on earth.