短文解释了生命是如何在地球上开始的.首先,地球爆炸产生水.因为水的存在,然后植物和动物,包括人类逐渐在地球上出现. The passage explains _____________on the earth. At first, the earth exploded and produced water. And then plants and animals _____________________appeared on the earth gradually because water _______on the earth.
how life began
including human beings
existed