Carrying capacity is the term that defines the fact that a forest can only support 50 deer.
Every ecosystem has a certain carrying capacity for each population it supports (different for each species and each type of environment), which is usually indicated by the letter "K".
When a growing population approaches the limit of the ecosystem's carrying capacity, environmental resistance is opposing that growth.
The fact that a forest can only support 50 deer, refers to the carrying capacity this ecosystem has to be able to sustain this population, attending to its minimum needs.
Therefore, we can conclude that carrying capacity is the term that defines the fact that a forest can only support 50 deer as it describes the maximum number of population that a natural area can support without destroying its essential ecological characteristics.
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