While morphology plays a role in understanding evolutionary relationships, it's not the sole study of those relationships. Here's a breakdown:

* Morphology is the study of the form and structure of organisms. It looks at things like:

* External features (shape, size, color)

* Internal structures (bones, organs, tissues)

* Developmental stages (embryology)

* Evolutionary relationships are determined by phylogeny. Phylogeny uses various sources of data, including:

* Morphology (as described above)

* Genetics (DNA, RNA sequences)

* Fossil evidence

* Biogeography (distribution of organisms)

In short: Morphology is a tool used within phylogeny, but phylogeny is the broader study of evolutionary relationships.