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Why do the roots always grow down and the stems grow up?


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Biology
why does animals change colours?
Bats have eyes or not ?
Nest of Ant
Changing flower
Cactus experiment
How does oxygen reach different part of the body ?
Germination of seed
How does food gets spoilt ?
Animals and their young ones
why do leaves change colour in the fall ?
Why does heart beats?
Roots of Carrot
Balsam plant experiment
What is haemoglobin, rbc and wbc ?
Crystal Culture
Thistle funnel experiment
Grassy brick
Why do the roots always grow down and the stems grow up?
How does a fish respire? Why does it die when it is taken out of water?
Carrot top