Question

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

Explanation:

In a cladogram, a node represents the point where a new - derived trait appears, indicating a divergence in evolutionary history. Evolution is not stopped at a node, an ancestor doesn't necessarily die at a node, and the cladogram doesn't end at a node.

Answer:

A. A derived trait appears.