Answer:
A radioisotope is a radioactive isotope.
Reintroduction of wildlife species means an attempt to resettle them within their historical area of distribution (within their range), where they have become extinct
I don’t know but it might be 4 or 8
Answer: It’s called a point mutation.
Explanation:
They spend more time in their den, and they also put on "layers of fat" to have fat reserves to fall back on since they'll be less food in the winter :)