Give reasons for the following:

The earth is the home of humankind.

Earth's orbit lies between

1. Venus and Mars
2. Mercury and Venus
3. Mars and Jupiter
4. Jupiter and Saturn

Earth's biosphere is also called

1. ecosystem
2. environment
3. atmosphere
4. hydrosphere

The average distance of earth from the sun is

1. 150 million km
2. 108 million km
3. 1433 million km
4. 228 million km