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References

1. Ministry of education (2015), Secondary Biology form two, Third edition, Kenya Literature Bureau, Nairobi

2. https://r3---sn-hc57en7d.googlevideo.com/videoplayback?expire=1561632371&ei=E0oUXanqCsLtkgbinIP4Cw&ip=216.158.205.120&id=o-AP2PF6d7LK4A87fRoe5iTYkOiWIOYLCGGTWQJH

3. https://youtu.be/CBv2BqqAydE

4. https://youtu.be/OZK8RMVXZXs

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