Question

in a cladogram, what occurs at a node? an ancestor dies. evolution is stopped. the cladogram ends. a derived trait appears.

Explanation:

A cladogram is a diagram used in cladistics to show the relationships among organisms. Nodes in a cladogram represent the common ancestor of the branches. At a node, a derived trait (a new trait that has evolved) appears. An ancestor dying is not what occurs at a node. Evolution is a continuous process and does not stop at a node. The cladogram does not end at a node; it continues to show further evolutionary relationships.

Answer:

A derived trait appears.