Anaximander - Arche, Apeiron and Analysis/Critique of Thales' cosmogony and cosmology

Hi everyone, can you help me with this question?

Anaximander states that the arche, the source of everything, should be the apeiron, the unlimited, the indefinite. After explaining how he comes to that conclusion, evaluate the significance of Anaximander’s contribution to philosophical activity in terms of his analysis and critique of Thales’ cosmogony and cosmology