biodiversity

definition: 
The variety of plant and animal life in the world or in a particular habitat, a high level of which is usually considered to be important and desirable.
sentence: 
The extra emphasis on biodiversity due to degradation of natural habitats and accelerating extinction rate of plants and animals worldwide has placed a higher emphasis on researchers documenting and describing new species before they disappear.
difficulty: 
easy
toefl frequency: 
3
toefl classification: