Simple past tense and past participle of threaten, adjective_ ecology, of a plant or animal At risk of becoming endangered in the near future, Feeling insecure or vulnerable, At risk of becoming extinct or of becoming an endangered species. Used of a plant or animal species

the ability to sustain something, the property of being sustainable, ecology a means of configuring civilization and human activity so that society, its members and its economies are able to meet their needs and express their greatest potential in the present, while preserving biodiversity and natural ecosystems, planning and acting for the ability to maintain these ideals for future generations

The relationship between organisms and their environment, the environment as it relates to living organisms, The branch of biology dealing with the relationships of organisms with their environment and with each other

of or pertaining to ecology, characterized by the interdependence of living organisms in an environment, not harmful to the environment