To solve this problem, we need to identify the term used for a species facing an extremely high risk of extinction in the immediate future.$\newline$Let's analyze each option:$\newline \bullet$Option 1: Vulnerable - This term is used for species that are at risk of becoming endangered if the circumstances threatening their survival and reproduction do not improve.$\newline \bullet$Option 2: Endemic - This term refers to species that are native to a particular area and are not found naturally anywhere else. It does not relate to the risk of extinction.$\newline \bullet$Option 3: Critically endangered - This term is used for species that are facing an extremely high risk of extinction in the immediate future.$\newline \bullet$Option 4: Extinct - This term is used when there are no surviving individuals of a species left.$\newline$Based on the definitions, the correct term for a species facing an extremely high risk of extinction in the immediate future is "Critically endangered."$\newline$Therefore, the correct option is Option 3.