The answer is because biology is easy and they're known around the world.
Answer:
Smaller unit in size as 1 centimeter equals to 10 millimeters.
Answer:
These rings can tell us how old the tree is, and what the weather was like during each year of the tree's life. Because trees are sensitive to local climate conditions, such as rain and temperature, they give scientists some information about that area's local climate in the past.
Explanation: