Evidence Of Evolution And Extinction

Question 1

What is a fossil?

Answer 1

The remains or impressions of a plant or animal that lived millions of years ago

Question 2

How are fossils formed?

Answer 2

Animal dies and is covered in sediment

More layers of sediment, no O2 means no decay

Skeleton replaced by minerals become rock

Earth movement may crack the rock, exposing the fossil

The lower the fossil, the older it is

Preserved in amber/ice

No O2

Too cold for decay

Question 3

What are examples of impressions and how do they form?

Answer 3

Footprints, burrows, rootlet traces

Sediment mineralises in a shape

Question 4

What does MRSA stand for?

Answer 4

Methicillin resistant Staph. Aureus

Question 5

What is extinction?

Answer 5

The loss of all individuals of the same species

Question 6

What are biological reasons for extinction?

Answer 6

New predators
New disease
Successful competition
Climate change
Asteroid impact

Question 7

What is mass extinction?

Answer 7

The loss of all individuals of several species

Question 8

What are reasons for incomplete fossil records?

Answer 8

Organism was soft bodied
Decay always occured
Fossils not yet found