Biology

The correct answer is: A. Opposable thumbs.

1. Understand how traits are represented on a cladogram:

On a cladogram, traits are listed at the points where branches diverge. Organisms that appear further along the branches from a particular trait - marking point possess that trait. Traits that are closer to the end of the branches (more derived) evolved more recently.

2. Analyze each trait:

Lungs: The trait “lungs” is placed relatively low on the cladogram. It is an ancestral trait for salamanders, lizards, hamsters, and chimpanzees. So, it is not the last - developed trait.

Claws or nail...