Which of the following statements about extinction is NOT true? 1. A species cannot recover from extinction. 2. Background extinctions are caused by natural phenomena. 3. Current extinction rates are...

Which of the following statements about extinction is NOT true? 1. A species cannot recover from extinction. 2. Background extinctions are caused by natural phenomena. 3. Current extinction rates are about 10 times higher than background extinction rates. 4. Mass extinctions occur when large groups of species go extinct in a geologically short (up to 5 million years) period of time.