why so many species in the world?

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Why there are so many creatures in the world. There are human beings, trees, water, earth, varieties of soils, varieties of waters, many types of mountains, seas, oceans, Animals, Carnivorous, herbivorous, varieties of insects, reptiles, fish, frog, fruits, vegetables, eatables, non-eatables, poisonous plants everything.....everything....What is the purpose of their creation? Again if we look at some creatures they all have got two genders like male and female. Why God has not filled the earth only with 2 types of human beings viz., males and females? Is there no work for God?