Evolution

Question 1

How does evolution happen?

Answer 1

• Selection pressures exist in environment (e.g. food source).
• Random mutations in genes lead to natural variation in organisms.
• The organisms with variations better suited to the environments survive and pass on their genes.
• Badly suited organisms die out and eventually the characteristics of the well-suited organisms become more common.

Question 2

What is natural selection?

Answer 2

• A mechanism for evolution.

* Explains how some characterises become more common.