He and his brother are as alike as two peas in a pod.

He is an expert in embryology, studying the developmental processes of many kinds of organisms.

The process of embryogenesis is very complex, with continuous cell division and differentiation.

He is writing a thesis on abiogenesis.

I am majoring in developmental biology at university.

When he had a problem due to his own actions, he remembered the phrase 'chickens come home to roost'.