Question

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

Explanation:

A cladogram is a diagram used in biology (subfield of Natural Science) to show evolutionary relationships. Nodes in a cladogram represent common ancestors from which different lineages diverge. At a node, a derived trait (a new trait that evolved and is shared by the descendants of that node) appears. Evolution doesn't stop at a node, an ancestor doesn't die at a node (nodes represent divergence, not death), and the cladogram doesn't end at a node (nodes are internal points for divergence). So the correct option is the one about a derived trait appearing.

Answer:

A. A derived trait appears