Final answer:
A clade is a group of organisms that includes an ancestor and all descendants, focusing on evolutionary relationships. A lineage is the historical sequ ence through time of a group's evolution. Thus, clades are concerned with relationships, lineages with history.
Step-by-step explanation:
Difference Between a Clade and a Lineage
The main difference between a clade and a lineage is their implication in evolutionary biology. A clade refers to a group of organisms that includes an ancestor and all of its descendants and is based on understanding the evolutionary relationships between organisms. This is a concept from cladistics, which organizes traits of species to determine ancestor-descendant relationships. A lineage, on the other hand, refers to the actual historical sequence of species or populations through time, showing how a particular group of organisms has evolved.
Therefore, the correct answer to the student's question would be: 1) A clade refers to the evolutionary relationship between organisms, while a lineage refers to the history of a group through time.