The first step in sensation for some sensory systems is the which modify incoming stimuli

The first step in sensation is reception. It makes use of accessory structures or sensory receptors which modify or respond to incoming stimuli. A stimuli is defined as a detectable change inside or outside an environment. Reception is the activation of these accessory structures by a stimuli. Examples of a stimuli are changes in temperature, pain, light, loud sound, etc.

The answer would be cstep by step explanation: all of the other animals developed their features while the salamander was born with them