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Do jellyfish have ears?
Jellyfish have no ears.Jellyfish lack basic sensory organs and brain, but their nervous systems generally allow them to perceive stimuli such as light and odor.
What has a nervous system but no brain 1 earthworm 2 hydra 3 cockroach 4 amoeba?
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.
What system do the cnidaria and comb jellies have that sponges lack?
Despite neither jellies nor sponges having central nervous systems, jellies have true tissues. The cells in jellyfish are also bound together, unlike in sponges.
Does everyone have a nervous system?
No, not all living organisms have a nervous system. Invertebrates like sponges, jellyfish, and corals lack a nervous system, while all vertebrates, including humans, have a nervous system.
Is it true that all animals without specialized nervous systems tend to be very small and very mobile.?
While many animals without specialized nervous systems, such as certain invertebrates, tend to be small and mobile, this is not universally true. Some larger organisms, like jellyfish and sponges, also lack complex nervous systems but can exhibit various forms of movement or remain largely stationary. The size and mobility of these animals are influenced by their ecological niches and evolutionary adaptations rather than solely by the absence of a specialized nervous system.
What does a jellyfish lack to be an invertebrate?
a backbone
What do jellyfish lack that fish possess?
Bones
Do amphibians have nervous system?
Yes they do, invertebrates have small nervous systems, which consist of many small brains. Because of the anatomy of their nervous systems and the lack of neurons, they are thought to have limited cognitive capacity, and this means that they are likely to not be capable of emotions like we feel. This is why scientists are unsure whether or not or to what degree they feel pain.
Is an jellyfish a gastropod or a bivalve?
No, jellyfish are neither of these. The gastropods and bivalves belong to the phylum Mollusca, whilst jellyfish are Cnideria. Jellyfish are in many ways more primitive than molluscs, and lack many of their structural features.
How do plants control their nervous system?
Plants lack nervous system.
Does a jellyfish lack a well defined head?
Yes; jellyfishes have no head.
What do invertebrate jellyfish lack that all other fish process?
spine
