If you cut a horizontal cross section through the trunk of a tree, you can see the tree's growth rings (also known as tree rings). Each ring inside the trunk of a tree represents the annual growth of the tree. There are two parts of a growth ring. The inner part is formed during the early growth season (spring and early summer in North America) and is relatively less dense. The outer part of each ring is denser and is formed during the late summer and autumn.
The growing conditions of a particular year will affect the size of a ring. In ideal growing conditions (such as adequate moisture and a relatively long growing season), a ring may be larger because the tree was able to grow more during that time. However, a cold summer or a drought can cause the ring size to be smaller than normal.
How old is the tree represented in the figure?

C. 8 years


Counting the rings reveals that there are 8 complete rings; hence the tree is 8 years old. Choice (C) is correct.

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