You are given a sentence and your task is to generate another sentence that supports the given input.

[EX Q]: The organization of the motor system is similar to that of vision, beginning with the primary motor cortex at the posterior edge of the frontal lobe.
[EX A]: The primary motor cortex is located in the frontal lobe of the brain.

[EX Q]: The speed of sound depends only on  the medium through which it travels, not on its frequency, wavelength, or intensity (until the intensity gets so great that a shock wave results).
[EX A]: The speed of sound depends on medium.

[EX Q]: Thus having four limbs is a derived feature that separates tetrapods (mammals, birds, amphibians, reptiles and some fish) from all other organisms.
[EX A]:
Birds have four limbs.