Darwin is related with evolution by natural selection. According to the theory in the struggle for existence, the individuals which have more favourable variations will survive and reproduce, while others, which have less favourable or unfavourable variations will not perpetuate..
Oparin: Put forth abiogenesis theory.
According to abiogenesis life is originated from the nonliving things spontaneously.
Lamarck: Use and disuse of organs is one of the important principle of Lamarckism.
Wagner proposed continental drift theory.
It states that part of the Earth's crust slowly drift atop a liquid core forming different continents. As these continents had different environmental conditions, so plants and animals evolved.