they can last forever
no.
It is classified as extinct when there are NO animals of that species left, not one.
about 10-40 years
Plants.
The dodo bird became extinct in the early 1600's. The Triceratops became extinct long before that.
There were 16 distinct varieties of Puerto Rican Tree Frog, two of which are extinct. The remaining 14 are about 1 inch long and are absolutely adorable. You can hear them all night long singing cooh-quiii. They are endangered and not invasive.
Not much longer:( they are being hunt down for there skin and the amazing creature will soon be extinct unless we stop.
They are extinct. the last one was trapped in 1903 in Moreno, California.
Flies will likely continue to evolve for another 1.1 billion years before extinction. The current species will have gone extinct (replaced with a new species of Fly) long before then.
Dinosaurs became extinct millions of years ago. Dinosaurs died off long before humans came into existence.
No. Sharks appeared on earth long before the first dinosaurs did.
No. If a volcano erupts then it is not extinct; during its period of inactivity it would have been dormant. To add to this. Two examples are the long-dormant Soufrière Hills volcano on the island of Montserrat, thought to be extinct before activity resumed in 1995 and Fourpeaked Mountain in Alaska, which, before its September 2006 eruption, had not erupted since before 8000 BC and had long been thought to be extinct. I am sure the odds are the same as winning the lottery every year for life.