C2H4 is the formula of ethylene

Root , leaves,stem are the parts of plant

You should well prepared, try to observe things in everyday lives that you can use in class. For more info you can see gurushala module

Find a silent place try to cocentrate on study , if you are unable, meditate for few minutes. Do yoga asanas in morning

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No it has very high density so that it does not float

Use the formula πr²

Veins arteries heart form circulatory system in our body