What happens to a fertilised egg?

Chapter topics:

1. What happens to a fertilised egg?
2. Where does the embryo develop?
3. What's inside an egg?
4. What is the difference between snake and bird eggs?
5. What does the colour of a bird's egg depend on?
6. When and what kind of nest do birds make?
7. When does an egg become a young bird?
8. Test or research
9. Mammals are viviparous animals
10. What does the duration of gestation depend on?
11. Why is feeding offspring milk beneficial?
12. Questions and tasks
13. Important terms 

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