Page 207 - Science Course 3 (Book 1)

Variations and Natural Selection Mo5-L3a: What is Natural Selection?
Lesson 3

adaptation
an inherited trait that increases an organism’s
In this topic, you will learn the following chance of surviving and reproducing in a particular
lessons: environment.

Mo.5–L3a: What is Natural Selection?
Mo.5–L3b: Why Traits Change?

Mo5-L3a What is Natural Selection?

KEY CONCEPTS:
1. How does natural selection occur?
2. What is an adaptation?

Vocabulary A-Z

Let us learn some vocabulary Let’s Begin

variation Mutations, Variations, and Natural Selection
a slight difference in the inherited trait among
individual members of a species. Slight differences in inherited traits among
individuals in a population are called variations.

The process by which individuals with variations that
help them survive in their environment live longer,
compete better, and reproduce more than those
natural selection individuals without these variations is called natural
the process by which organisms with variations that selection.
help them survive in their environment live longer,
compete better, and reproduce more than those that
do not have variations.

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