REFERENCES

1. SECONDARY BIOLOGY STUDENT'S BOOK THREE-KLB PAGE 82-86

2. ONLINE VIDEOS AND IMAGES: I) https://www.youtube.com/user/elearningbiochannel.

                                                        ii)data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAkGBxQSEhUTExMWFhMXFhsaGRcY