The marine iguana is a carnivorous animal that feeds on fishes.  It swims using its powerful arms.

Sexually dimorphic fishes are those in which the males and the females look different in their external anatomy.

Based on molecular evidence, the closest living relative of whales appears to be the hippopotamus.

Which of the following is true about mammals?

Many bony fishes are broadcast spawners that release their gametes directly into the water.

Countershading is a coloration pattern common to fishes that swim in the upper layers of the ocean (pelagic).  In order to camouflage themselves in this environment, these fishes have a dark belly and a light colored dorsal surface.

In order to waterproof their feathers, birds may use oil, which they collect from an oil gland (the preen gland) at the base of their tail.

Guano is a waste material produced by birds. It contains uric acid, a white paste that helps the bird’s kidneys to conserve water.

There is only one species of coelacanth alive today.  This species is found in the waters around South Africa.

Which of the following is not a trait that help birds to fly?