Evolution and Natural Selection

What is suggested by the similarity of early embryos of different species of vertebrates?

• no evolutionary relationships between the groups

• similar environments in the past

• evolution from a distant common ancestor

• similar fossils found

Two organisms that are closely related would have

• very similar DNA sequence

• no proteins in common

• identical DNA sequence

• completely different DNA sequence

Study of embryos of various organisms to show a common ancestor because of similarities in development

• natural selection

• Evolution

• Embryology

• Taxonomy

Structures with similar parts but have different functions; suggests that organisms share a common ancestry

• vestigial structures

• Analogous structures

• homologous structures

• Fossil

The most recent ancestral form or species from which two different species evolved is known as ________________________.

• a common ancestor.
• an embryonic stage.
• development.
• evolution.

Common ancestry relates to evolution because

• evolution only happens when there are common ancestors.
• Common ancestors make evolution happen more quickly.
• evolution can never take place with common ancestors.
• the more two organisms have in common, the more recent is their common ancestor during their evolution.

What type of evidence is represented in the picture above:

• Fossils

• Vestigial Structures

• Analogous Structures

• Homologous Structures

What type of evidence is shown in the image above?

• Fossils

• Vestigial structures

• Homologous Structures

• DNA

The similarities of the bones in the diagram provide evidence that---

• The organisms shown lived in the same natural envionrment
• The organisms shown may have developed from a common ancestor
• The organisms shown have the same genetic diseases
• The organisms shown are modern version of the past

Choose ALL examples of a vestigial structure?

• A whale's pelvic bones

• A manatee's fingernails

• A human's nose.

• A human's appendix.

• A human's wisdom teeth.