A turtle's heart can beat even outside the body.
Why it is true
Reptile hearts like turtles' can continue beating outside the body for some time due to their physiology.
Source: Veterinary Science
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.