Embryology
How things are alike or the same.
Similarity
A group of living things that are very similar and can reproduce with each other.
Species
How things are not the same.
Difference
When different living things come from the same ancestor long ago.
Common Ancestor
The way a living thing grows and changes over time.
Developmental pattern
Body parts in different organisms that are similar because they come from the same ancestor, even if they have different functions.
Homologous Structures
An early stage of a living thing before it is born or hatched.
Embryo
The study of similarities and differences in the body structures of different organisms.
Comparative Anatomy
The study of how a living thing grows and develops from a fertilized egg.
Embryology
Body parts in different organisms that have similar functions but different structures and do not come from a common ancestor.
Analogous Structures