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  15.)   negative  EFFECT                                                                  

- causes skin cancer

-causes sunburn

- damages the immune system

-fades colors

                 positive effects ( necessary)

- it triggers vitamin D -- VITAMINE HELPS STRENGTHEN BONES , MUSCLES AND BODYS IMMUNE SYSTEM.

- USEFUL FOR DISINFECTION AND STERILISATION

Explanation: THE EARTHS ATMOSPHERE BLOCKS MOST OF THE SUNS UV RADIATION FROM PENETRATING THROUGH THE ATMOSPHERE. THE SMALL AMOUNT THAT GETS THROUGH HAS BOTH POSITIVE AND NEGATIVE.

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics

the dna of humans and mice is almost 92% similar. this similarity indicates that . mice have a tail, while humans have a tailbone. the tailbone is a structure in humans.yes it's true.