How can you calculate the age of a tree?

Question: How can you calculate the age of a tree?

Options:

Measuring its height
Counting the rings of its trunk
Looking at the leaves
Depending on how hard the trunk is

Correct answer:

Counting the rings of its trunk

Other game answers:
Find the answers to guess the gif, logo quiz 2015, emoji puzzle and emoji nation.
You can find other questions and answers of trivia crack at triviacrackcheats.org (other languages are also available, for this game).