T4W5 TS Q26 – Selective High School

A biologist studies the population reduction rate of a species to determine whether they are endangered.

When the population of a species has declined at least 70% and the cause of the decline is known, it is classified as endangered.
It is also classified as endangered when the population of a species has declined at least 50% and the cause of the decline is not known

Which of the following options is not possible?

The Chinchilla Rat was placed on the endangered list because its population had declined by 60% due to habitat loss. The Dammah Oryx was placed on the endangered list because its population had declined by 90% due to overhunting. The Dammah Oryx was placed on the endangered list because its population had declined by 60% with no clear indication of the cause. The Chinchilla Rat was placed on the endangered list because its population had declined by 90% with no clear indication of the cause.

Are you sure you want to leave?

Which of the following options is not possible?