Biology

The correct answer is: B.Amount of genetic change since divergence

Explanation:

The branch lengths on a phylogenetic tree typically represent the amount of genetic change or evolutionary time that has passed since two species or groups diverged from a common ancestor. Longer branches indicate more genetic change, while shorter branches suggest less change.

Here’s why the other options are incorrect:

A.The age of the organisms: The branch length does not represent the age of the organ...