facts Quiz

Question Number 1 sharks have to continuesly swim because: A. the have no air bladder and they will sink B. to catch food C. to clean themselves D. to run from enemies Question Number 2 first kind of lasers invented were A. wave B. helium-neon C. electromagnetic D. infra red Question Number 3 we see ourselves in mirror because of A. refraction B. reflection C. it is magic D. none Question Number 4 largest organ of our body is A. small intenstine B. liver C. stomach D. skin Question Number 5 how long does a tortoise live A. 100-160 yrs B. 50-60 yrs C. 1000 yrs D. 1500 yrs