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Answer: The group to which jellyfish belong is Coelenterata or phylum Cnidaria. Thus, the correct answer is option D.
Complete Answer:
Jellyfish belong to the phylum Cnidaria, also known as Coelenterata, a diverse group of simple, aquatic, mostly marine animals. This group also includes corals, sea anemones, and hydras. Cnidarians are characterized by their radially symmetrical body structure, meaning their body parts are arranged around a central axis.
Jellyfish have a gelatinous, umbrella-shaped body called a medusa, with long, flowing tentacles hanging below. These tentacles are lined with specialized stinging cells known as cnidocytes, which contain nematocysts. Nematocysts are tiny, harpoon-like structures that release toxins to paralyze and capture prey. This unique adaptation helps them feed on small fish, plankton, and other microscopic marine organisms.
Unlike most animals, jellyfish lack a brain, heart, and bones. They have a simple nervous system known as a nerve net that allows them to sense changes in their environment and respond to touch.
Jellyfish have a single body cavity called the gastrovascular cavity, which functions for both digestion and circulation, with a single opening acting as both mouth and anus.
They have a complex life cycle, alternating between polyp and medusa stages, allowing them to adapt to changing marine conditions. Despite their simple body plan, jellyfish have survived for over 500 million years, making them one of the oldest living creatures on Earth.
Thus, the group to which jellyfish belong is Coelenterata.
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