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