Concept:Frogs possess several aquatic adaptations, especially well-developed webbed feet, that make them more efficient swimmers than toads.
Explanation:The frog has prominent webs between the digits of its hind limbs.
These webbed digits greatly increase the surface area of the feet.
A larger surface area allows the frog to push against more water with each backward stroke.
This produces a stronger forward thrust and improves swimming efficiency.
Toads, in contrast, have less prominent webbing and are more adapted to a terrestrial lifestyle.
Their feet cannot push water as effectively, so they swim more slowly and less skillfully.
Although frogs also have strong hind limbs and a streamlined body, the most direct swimming advantage over toads is the more pronounced webbed digits.
Answer:A. has more pronounced webbed digits