<span>A. endoskeleton
</span>Endoskeleton is not a characteristic of Arthropods that has attributed to their diversity and success. Endoskeleton is defined as inner characteristics of the skeletal feature of an organisms such as bears, humans, fish and etc.
Exoskeleton on the other hand is the trait by which arthropods posses. It is skeletal feature that is described outside or is extrinsic, this is evident as crabs have their skeletons outside of their body.
Layers of fossils in pillars, the rock covering them is dated and we get an exact time of each layer.
Answer:
Sensory neurons
Explanation:
Sensory neurons receive impulses and carry them from the sense organs to the spinal cord or brain.
