Read the following article and select the best answer. Article: When someone says extinct animals, you may think about dinosaurs . But now many other animals are becoming less and less in number. These animals might disappear from the earth very soon. Take a look at the following animals. They are all in danger. The African Elephant The African elephant is a clever animal. It has a very good memory. But people kill it for its tusks . Half of the African elephants have disappeared. The African Lion The African lions have nowhere to live because of wars in Southern Africa. Besides, hunters and farmers often kill them. The Tortoise George is a tortoise. It is the last Pinta Island giant tortoise. It was found in 1971. Now it lives in a research station. It can still live for another 200 years. But it is the last one of this species of tortoise. The Tadpole Shrimp Maybe you've never seen a tadpole shrimp. This is one of the oldest species on the earth. People have found them in fresh water pools on four continents . A tadpole shrimp can only live for two months or less. Question: The tadpole shrimp _ . - is in danger because of its special illness - lives on four continents - lives in a research stations now - is the second oldest species on the earth
A:
lives on four continents