Page 121 - Science Course 3 (Book 1)

Evidence for Evolution Mo3-L3a: What is the Evidence for Evolution?
Lesson 3

Analogous Structure
body parts that perform a similar function but
In this topic, you will learn the following differ in structure.
lessons:

Mo.3–L3a: What is the Evidence for Evolution?
Mo.3–L3b: How Are Organisms Related?

What is the Evidence for
Mo3-L3a Evolution?

KEY CONCEPTS:
1. What evidence from living species supports the
theory that species descended from other species
over time?
Vestigial Structure
body part that has lost its original function through
Vocabulary A-Z evolution.
Let us learn some vocabulary

Comparative Anatomy
the study of similarities and differences among
structures of living species.

Let’s Begin

Evidence for Evolution

The degree to which species are related depends on
how closely in time they diverged, or split, from their
common ancestor.

Although the fossil record is incomplete, it contains
many examples of fossil sequences showing close
Homologous Structure ancestral relationships.

body parts of organisms that are similar in structure
and position but different in function.

Donkey Modern Horse
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