I said "among" the most, not "the" most. I'm talking about sharks from a biological standpoint, not behavioral or psychological. In all of nature, their design ranks high among the most complex. They are highly advanced predators.
"their design ranks high among the most complex. They are highly advanced predators."
They are efficient, but not complex. In fact the opposite could be said. They are so efficient because they are so simple. But since you disagree with me, what is so complex about their design which has gone virtually unchanged for millions of years?