Dashavatara - Theory of Evolution

Dashavatara refers to the ten avatars or incarnations of Lord Vishnu to restore the cosmic order, The  Avatars being Matsya, Kurma, Varaha, Narasimha, Vamana, Parashurama, Rama, Krishna, Kalki and either Balarama or Buddha are included to complete the list. 

Some modern interpreters see Dashavatara as a great great grand father of Darwin's Theory of Evolution. The gradual evolution from the simplest to the most complex.

In 1877,Theosophist Helena Blavatsky in her opus Isis Unveiled proposed the following order of Avatars:

• Matsya or fish - the first class of vertebrates, evolved in the water. This indicates the origin of fish in the Silurian Period.
• Kurma or Tortoise - living in water and land. Indicates the origin of Amphibians in the Devonian Period. 
• Varaha or hog - wild land animal. Indicates the origin of mammals in Triassic Period. 
• Narasimha or a being that is half human and half animal. Indicates the emergence of human thoughts and intelligence in powerful wild nature, 
• Vamana or a short, predecessor of human beings. 
• Parasurama represents early human beings living in forests, who uses weapons. 
• Rama represents humans living in community - beginning of civil society. 
• Krishna represents a period when animal husbandry is practised and also a politically advanced society. 
• Buddha is a representation of humans attaining enlightenment. 
• Kalki represents advanced  humans with great powers of destruction. 

According to Keshub Chandra Sen, a prominent figure in Brahmo Samaj, "The Hindu Avatar rise from the lowest scale of life through the fish, the tortoise, and the hog up to the perfection of humanity. Indian Avtarism is,indeed, a crude representation of the ascending scale of Divine creation. Such precisely is the modern theory of evolution". 

* Since Krishna and Balarama belonged to the same period, and Balarama depicted as carrying a plough, i think. it was also a period when agriculture was practised. 
*Split the word Kalki into Kal , Ki. In hindi 'kal ki' means tomorrow's / of tomorrow.