Evidence for Evolution 4.6.3.4, 4.6.3.5, 4.6.3.7

Question 1

How do fossils form?

Answer 1

• Preservation due to lack of decay
• Replacement by minerals
• Casts and impressions-preserved traces of footprints

Question 2

Why are fossil records incomplete?

Answer 2

• Many early life forms were soft bodied, which means that they have left few traces behind.
• What traces there were may have been destroyed by geological activity.
• Scientists cannot be certain exactly how life on Earth started.