So, on what finger do you wear a promise ring? In the USA and the UK, the ring finger (fourth finger) of the left hand holds the greatest significance; engagement rings and wedding rings are worn on this finger almost without exception.
In biology and ecology, extinction is the end of an organism or of a group of organisms (taxon), normally a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively.
Extinctions can happen for many reasons but recently people have been a major cause. Over hunting can led to extinction as can diseases, climate change or habitat loss which is when animalâs homes are destroyed. In the past, there have been very large extinctions where many species have gone extinct together. This is called an extinction event. One of these events wiped out the dinosaurs. 65 million years ago, all dinosaurs (except birds) went extinct as did many other types of plants and animals.