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Ans 4:
Class : Class 6
I HAVE WON THE FIRST GOLD MEDAL IN SCIENCE OLYMPIAD 1st LEVEL AND I HAVE A MERIT CERTIFICATE AND PARTICIPATION CERTIFICATE IN 2nd LEVEL.........I AM HAPPY..............
Ans 5:
Class : Class 9
the answer must be C . this is because fat in the form of cholestrol gets collected in the blood vessels owing to chances of heart attack
Ans 6:
Class : Class 7
answer can be correct but loss of minerals and vitamins also causes blood vessels to make blood vessels not that strong and to carry less blood so b and c both are correct