A species that has decreased until it is almost
endangered is considered
A species that no longer exists is considered
The term used to describe the wide variety of life on
Earth is
A species that may become extinct if its population
decreases further is considered
A condition that controls the size or growth of a
population is called a(n)
When a community has stabilized and succession
has slowed down or stopped, it is a(n)
The gradual replacement of one community by another
is called
The first species to establish themselves in a lifeless
area form a(n)