The Presiding Officer of the United States Senate is the person who presides over the United States Senate and is charged with maintaining order and decorum, recognizing members to speak.
The vice president of the United States is the presiding officer of the senate.
I believe the answer is: <span> have external ears
The seals on the other hand, only have small gap in the side of their heat but </span>lack an external ear<span> flap.
The function of the external ears are very similar to humans' , But sea lion's ears have different structures that help them to sustain pressure to protect them when they're diving.</span>
