1)According to Choo(2008),the process of clearance the  tropical woods caused greatly damaged to the surrounding.

2)The university students have distinctive learning system compared to school which is they have guided by many expert lecturers according to Nair,V.(2005)

1) Scientist use animals for experimental use of invulnerability and capability of freshly medicine because humans and animals have similar distinctive characteristics before they are undergo pilot test among small number of patients according to Teo Kim Mun,(2006).

2)Akmar Saad,(2008) said that they are not be able to concentrate on  a book because of their  short consideration period.But,televisions give them colourful world every half an hour which can attract their interest.