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10677 views	0 answers	Which is the hardest substance in your body? updated 7 years ago by attemptnwin
2499 views	0 answers	How is water retained by the soil? updated 7 years ago by attemptnwin
9076 views	0 answers	How do leeches suck blood? updated 7 years ago by attemptnwin
19729 views	0 answers	What does rain water consists of? updated 7 years ago by attemptnwin
11347 views	0 answers	How do invertebrates survive? updated 7 years ago by attemptnwin