Carrying capacity is the main answer.
Maximum number of members of a population that a habitat or ecosystem can support. This happens when the available resources have been used to their maximum extent, meaning that they are being used up faster than they can be replenished. As a result of rivalry and shortage, a large portion of the population is now dying out.
<h3>What is Carrying capacity ? </h3>
The typical population size of a species in a given habitat is referred to as carrying capacity. Environmental elements including sufficient food, shelter, water, and mates are able to control the population number of the species. The population will decline until the resource recovers if these needs are not supplied.
In nature, when the maximum population size is attained for a certain area with limited resources, the population of that area may exceed capacity. For instance, a pond with ten turtles living in it at first will support the population of that species.
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