Detailed Instructions: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Q: What factor might influence why earlywood is lighter in color than latewood?, Context: If there are differences within a growth ring, then the part of a growth ring nearest the center of the tree, and formed early in the growing season when growth is rapid, is usually composed of wider elements. It is usually lighter in color than that near the outer portion of the ring, and is known as earlywood or springwood. The outer portion formed later in the season is then known as the latewood or summerwood. However, there are major differences, depending on the kind of wood (see below).
A:
growth is rapid