It would automatically be assumed that an earthworm does not have a exoskeleton because of the way they look and feel. They are very flexible and soft to the touch.
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Earthworms belong to the phylum Annelida, which are characterized by having soft, flexible bodies. Unlike organisms with exoskeletons, such as insects or crustaceans, earthworms have a hydrostatic skeleton that allows them to move and burrow through soil efficiently. The lack of a hard outer covering like an exoskeleton enables earthworms to navigate through narrow spaces and absorb nutrients through their skin.
Root cells lack chloroplasts.Thats because they do not get light.
Nervous system, respiratory system, and circulatory system lack nephridia.
Proprioception
Lack of Oxygen.
Earthworms and cockroaches have nervous systems but no brain. Hydras have a nervous system consisting of a nerve net but lack a centralized brain. Amoebas do not have a nervous system or a brain.