When a government is trying to protect an endangered species, they will usually make it illegal to hunt them. They may also set up a sanctuary for the animal.
by doing nothing
The two devices that assist in the prevention of extinction are: game reserves and lodges (frequently with hunting) and zoos.
Urban Growth and Desolation
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Vulnerable, or Threatened. Both mean that events could endanger the species because of habitat change, or because the population level is low enough to where they could be endangered if the loss of some of the population occurs.
These are called "mass extinctions", and there have been five such events (that we know of) on the Earth. These are generally caused either by astronomical impact events (such as the asteroid that killed off the dinosaurs 65 million years ago) or massive volcanic activity. The causes of these extinctions has been a matter of some dispute, since they happened so long ago.
The two devices that assist in the prevention of extinction are: game reserves and lodges (frequently with hunting) and zoos.
The nouns in the sentence are species and extinction.
some people are trying to keep those plants in green houses where they are over looked.
It frees up ecological niches for other species.
Urban Growth and Desolation
It depends on which toads you are talking about. As a general species no they are not, but some of the species like the Kihansi spray toads are.
Some or several species become extinct every day.
Some effect of deforestation are:local: locals move, flooded crops, habitats lost, extinction of species national: big companies are rich, habitats lost, extinction of species global: global warming/greenhouse effect, habitats lost, extinction of species
Some species are threatened with extinction, while others are not. All species are in decline due to habitat loss.
Because of many people
When a species is threatened, many of the governments of the host countries of the said animal try to enact laws to help protect these animals. Many charity organizations also help in trying to get the word out to the general public about these endangered animals. It also depends on what is exactly causing the extinction. Global warming and deforestation are two huge factors, and these have been on the radars of many animals for some time.
As of now, the polar bear is a vulnerable species, not on the endangered species list, as some populations are increasing.