Your first sentence seems like it's conflating correlation with causation.
As for the second, saying psychology is ultimately biology is reductionist in a way that dismisses the context and environment biology gets expressed in. You would be a much different person if the same set of genes was born in a different place, or at a different time, or if your life circumstances were different in any mild way.
As for the second, saying psychology is ultimately biology is reductionist in a way that dismisses the context and environment biology gets expressed in. You would be a much different person if the same set of genes was born in a different place, or at a different time, or if your life circumstances were different in any mild way.