4. Earth differs greatly from its two closest neighboring planets, Venus and Mars. The Venusian and Martian atmospheres are composed almost entirely of carbon dioxide, while Earth's atmosphere contains very little. The dominant material in our atmosphere is nitrogen (77 percent). The other major component of Earth's atmosphere is oxygen (21 percent), a gas that is almost nonexistent on Venus and Mars. Our planet has an abundance of water which covers about 70 percent of Earth surface and supports life on our planet. In contrast, Venus and Mars are extremely dry planets and incapable of supporting life. Write F if the following statement is Facts and I if it is Inference.
1. Earth, Venus and Mars are close to one another but they are different in many ways.
2. There are not living things on the Moon.
3. There is little O2 on Venus and Mars
4. The proportion of water and land on earth approximately 7:3. is
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