Name a hard part of an animal which will not decay easily

Why are some fossils destroyed over time?

How can a new predator cause extinction of a species?

Suggest another factor could have caused the dinosaurs to die out

How do populations become isolated?

What is meant by genetic variation?

How old is the Earth?

When do we think life on Earth began?

How are fossils dated?

Why are there no fossils of early life forms?

What is the shortest way to represent three billion in numbers?

How might a new competitor cause the extinction of some species?

Suggest two ways that people can cause the extinction of some species

What are the two main ideas put forward for the extinction of dinosaurs?

What is meant by 'geographical isolation'?

What are the stages in speciation?