Cevap:
EXERCISE 21
many species are in danger because people are hunting wild animals
Deforestation cause global warming because trees are producing oxygen
we should use public transportation because cars produce exhaust fume
nuclear waste has bad effects on life because it causes genetic problems
EXERCISE 22
1-T
2-T
3-F
4-F
5-T
6-F
7-F
8-T
