The plant or animal is said to have become extinct.
extinct
I have a large chunk of sigillaria (first cousin of the Lepidodendron) from Arizona that my great-uncle obtained many, many decades ago. The other fossils were Triasic, I believe. But the Lepidodendron and Sigillaria were Carboniferous trees, which flourished when our atmosphere was 30% more dense than it is now. Could they have survived into the Triasic?
There might a rare plant that lives in volcanoes and if a volcano erupts it might become extinct
because it can
Unless it lives forever, a plant would become extinct if it doesn't reproduce.
no it is not extinct
There are no living examples left anymore.
It's called Endangered if a species is threatened to go extinct.
When the last individual organism dies the animal or plant will become extinct.
500 species
If something else eats a plant or animal that becomes extinct, it might become endangered. But it would most likely just find something else to eat.