The primary somatosensory cortex is found in the while the secondary somatosensory cortex is located in the

The primary somatosensory cortex is found in the post central gyrus, while the secondary somatosensory cortex is located in the parietal lobe.  Neurons in the primary motor cortex to start to discharge just prior to a movement and discharge during a movement. 

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spiders belong to a group of arachnids.

arachnids have the following traits :

they have two body parts.

they have eight legs unlike insects which have 6 legs.

they have no wings.

these traits distinguish them from insects.

the information that antonio is doubting us the statement that spiders differences are as a result of being first to evolve.

this is because the evolution of one species is independent of the other species.