- It contains 85-90% of the atmosphere’s mass
- It contains nearly all the water and oxygen of the atmosphere
- It is the zone which exhibits changes in condition of weather
- It is about 350 km thick
- Spuntnik I
- Luna II
- Vostok I
- Apollo XI
- Vitamins B1
- Vitamins B12
- Vitamins E
- Vitamins K
- Mercury
- Marx
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- Marx
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- Lead
- Iron
- Mercury
- Copper
- Troposphere
- Ionosphere
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- Stratosphere
- Neptune
- Jupiter
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- Mars
- Over production
- Natural selection
- Inheritance for acquired characters
- Competition for survival
- Steel
- Rubber
- Glass
- Sponge
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