Evolution and extinction 4.6.2.2,4.6.3.1+4.6.3.6

Question 1

What is the Theory of evolution?

Answer 1

The Theory of Evolution by Natural Selection states that all species of living things evolved from simple life forms that first developed more than 3 billion years ago.

Question 2

What is Darwin’s theory of evolution?

Answer 2

• Individuals in a species show a wide range of variation
• Caused by differences in genes
• Characteristics most suited to the environment are more likely to survive and reproduce
• Successful genes are passed to their offspring

Question 3

How does extinction occur?

Answer 3

occur when there are no more remaining individuals of a species still alive.

Question 4

What are the reasons species become extinct?

Answer 4

• Lack of genetic variation
• Hunting
• Pollution
• Climate change
• Habitat destruction
• Competition