What type of skeleton does a vertebrae have

a. exoskeleton

b. endoskeleton

c. none

In a cross between individuals of a species of tropical fish, all of the male offspring have long tail fins, and none of the females possess the trait. mating two of the f1 fish fails to produce females with the trait. explain the inheritance pattern of the trait.

Why do we perceive objects as retaining their brightness under different lighting levels?

What form of anesthetic was used for field surgery