Word Power
This word means a plant or animal no longer lives anywhere on Earth.
→ What is extinct?
Fossils are usually found buried in this.
→ What is rock?
A human arm and a whale flipper have similar bones inside. This is an example of what?
→ What are homologous structures?
An embryo is a baby organism in an early stage of development.
→ What is embryo?
What is one type of evidence scientists use to study the past?
→ What are fossils?
This word means proof or information that helps show something is true.
→ What is evidence?
If a fossil is found deep underground, it is usually (older or younger)?
→ What is older?
If two animals have similar bone patterns, they may share a ______.
→ What is a common ancestor?
Scientists compare embryos to look for ______ between species.
→ What are similarities?
Why is the fossil record important?
→ It shows how living things have changed over time.
This is an early stage of a living thing before it is born or hatched.
→ What is an embryo?
If no living members of a species are alive today, the species is ______.
→ What is extinct?
True or False: Homologous structures always do the same job.
?
→ What is False
If two embryos look alike early on, scientists think they may share a ______.
→ What is common ancestor?
If scientists find fossils of a small ancient horse and larger modern horses, what does that show?
→ Horses changed over time.
All the fossils scientists have found and studied together are called this.
→ What is the fossil record?
If older fossils look different from newer fossils, this shows that species can ______ over time.
→ What is change?
Why is a bat wing and a human arm considered related?
→ Because their bones are arranged in a similar way.
Why is studying embryos helpful?
→ It gives evidence about relationships between species.
Name TWO types of evidence scientists use to study evolution.
→ Fossils, embryos, homologous structures.
When two animals have similar body parts because they came from the same ancestor, those parts are called this.
→ What are homologous structures?
Why do fossils help scientists learn about animals that lived long ago?
→ Because fossils are evidence of past life.
What do similar body parts tell scientists about animals?
→ They may be related.
If fish and human embryos look similar at first, what might that suggest?
→ They may be related long ago.
Explain how fossils and similar body parts help scientists understand how animals are related.
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