Evidence for Evolution

When looking at the fossil record, the oldest fossils are...

• Located near the surface

• Deepest underground in the oldest layer of rocks

• Usually show the most complex organisms

• The coolest

Answer explanation

Fossils of the simplest organisms are usually found in the oldest layer of rocks

Tags

NGSS.MS-LS4-1

A shared ancestor between two or more species is called a...

Answer explanation

A common ancestor!

Tags

NGSS.MS-LS4-2

Structures that are similar in arrangement, function, or both that suggest a common ancestor are called

• Homologous structures

• Analogous structures

• Vestigial structures

Tags

NGSS.MS-LS4-2

Structure found in an organism that is no longer in use but at some point may have been useful to ancestors

• Homologous structure

• Analogous structure

• Vestigial structure

Structures that are similar in function, but not similar in structure or origin. They do NOT provide evidence of a common ancestor.

• Homologous structures

• Analogous structures

• Vestigial structures

Which do you think are MOST closely related?

• Fish & rabbit

• Fish & man

• Rabbit & man

Answer explanation

The rabbit and human embryos continue to look similar for longer while they develop. This is evidence of a common ancestor.

Tags

NGSS.MS-LS4-2