The earth rotates on its axis at one thousand miles an hour; if it turned at one hundred miles an hour, our days and nights would be ten times as long as now, and the hot sun would then burn up our vegetation during each long day, while in the long night any surviving sprout would freeze.
Again, the sun, source of our life, has a surface temperature of 12,000 degrees Fahrenheit, and our earth is, just far enough away so that this 'eternal fire" warms us just enough and not too much! If the sun gave off only one-half its present radiation, we would freeze, and if it gave half as much more, we would roast.
The slant of the earth, tilted at an angle of 23 degrees, gives us our seasons; if it had not been so tilted, vapours from the ocean would move north and south, piling up for us continents of ice. If our moon was, say, only 50 thousand miles away instead of its actual distance, our tides would be so enormous that twice a day all continents would be submerged; even the mountains would soon be eroded away.
If the crust of the earth had been only ten feet thicker, there would be no oxygen without which animal life must die. Had the ocean been a few feet deeper, carbon dioxide and oxygen would have been absorbed and no vegetable life could exist. Or if our atmosphere had been thinner, some of the meteors, now burned in space by the million every day would be striking all parts of the earth, starting fires everywhere.
Because of these, and host of other examples, there is not one chance in millions that life on our planet is an accident.