Question

Be able to explain the evolutionary path to vertebrate nervous systems of the four corresponding organisms, cnidarians, flatworms, earthworms, and arthropods.

Answer 1

Cnideria( jellyfish) it is a radial animal with the nervous system like a nerve net it's a mesh of nets spreads throughout the body and detect stimuli.

Planarium(flatworm) it has a longitudinal nerve chords,nerve bundels in the absence of true brain, clusters of nurons like Ganglia.

Annelida(earthworm) it has simple brain and a nerve chord which runs the length of the back , neurons near the mouth performs integrated nervous system junction.

Arthropods(grasshopper) they have sophestsophis body plan with nervous system and are more complex they have compound eyes and specialized antenna.