Question

Definition: this is the study of the early development of an organism, and it is quite often used to show similarities and differences between different organisms in their early stages of development.

Answer 1

Embryology

Comparative Embryology --> similarities and differences between organisms

Answer 2

Embryology

Step-by-step explanation:

Embryology is the branch of biology that deals with the study of embryos.

An embryo is a structure representing early developmental stage of multi-cellular animals.

Hence, the study of early development of an organism is termed embryology. Comparative embryology deals with comparison of embryos of different organisms to assess similarities or differences between the organisms.