What is defined according to reproductive isolation and morphology?

Reproductive isolation refers to a set of mechanisms that prevent different species from interbreeding, thus maintaining species boundaries. This can occur through prezygotic barriers (e.g., temporal, behavioral, or mechanical isolation) and postzygotic barriers (e.g., hybrid inviability or sterility). Morphology, the study of the form and structure of organisms, often plays a key role in defining species, as distinct physical traits can indicate genetic divergence and reproductive isolation between populations. Together, these concepts help biologists categorize and understand biodiversity and species evolution.