Hint: They can only be found in remote locations
Hint: Think about how other species may have got to the Galapagos
Hint: Think about some of the characteristics that have helped the tortoises survive over thousands of years.
Hint: The tortoise population has decreased severely over the past few hundred years
Hint: In Galapagos, the plants change as you move from one part to another part of an island
Hint: The answer is also impacting many other species on the Galapagos Islands
Hint: What information is useful to scientists studying the tortoises