Answer key part 2
1. d)
2. The Sun and the Earth
3. True
4. c)
5. A start that went supernova (exploded)
6. 4.6 billion years ago
7. An asteroid that collided with Earth
8. Carbon, hydrogen, nitrogen, oxygen
9. Gases from volcanoes
10. Natural selection
11. Precambrian
12. Paleozoic
13. Chimpanzees
14. Bipedalism
15. a) Freed our hands
b) Superior mental capabilities
16. a) Relative dating
b) Absolute dating
17. The deeper the layer, the older it is.
18. False --> Absolute dating is more accurate
19. 2.85 x 109 km
20. False --> limit of our solar system
21. False --> satellite
22. True
23. a) Fish & mammals b) Algae & ferns
c) Protists, bacteria & fungi
24. a) AU b) LY c) Km
25. Volcanoes and asteroid impact
26. False --> Precambrian
27. Bipedalism
28. False --> bigger and taller
29. A sedimentary rock took the shape of the organism's remains
30. Moon