Final answer:
In biology, species, lineages, and taxa are considered fundamental units in evolution. Species represent a group of organisms that share common characteristics and can interbreed to produce fertile offspring, lineages represent a sequence of species that evolve from a common ancestor, and taxa provide a hierarchical classification system to organize and categorize organisms based on their evolutionary relationships.
Step-by-step explanation:
In biology, species, lineages, and taxa are considered fundamental units in evolution. Species is a fundamental unit as it represents a group of organisms that share common characteristics and can interbreed to produce fertile offspring. Lineages are also fundamental units as they represent a sequence of species that evolve from a common ancestor. Taxa, which include kingdoms, phyla, classes, orders, families, genera, and species, provide a hierarchical classification system to organize and categorize organisms based on their evolutionary relationships.