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  • Annelid | Definition, Characteristics, Habitat, Reproduction, Diet . . .
    Annelid, any member of a phylum of invertebrate animals that are characterized by the possession of a body cavity (or coelom), movable bristles (or setae), and a body divided into segments by transverse rings, or annulations, from which they take their name The coelom is reduced in leeches, and
  • Annelid - Segmentation, Metamorphosis, Reproduction | Britannica
    Annelid - Segmentation, Metamorphosis, Reproduction: It has been said that annelids are the most highly organized animals with the power of complete regeneration The powers of regeneration are greater in the polychaetes and lower oligochaetes than in the higher oligochaetes; leeches lack the ability to regenerate
  • Structure and classes of annelid | Britannica
    annelid , Any member of a phylum (Annelida) of invertebrate animals that possess a body cavity (coelom), movable bristles (setae), and a body divided into segments by crosswise rings
  • Annelid - Segmentation, Setae, Metamerism | Britannica
    Annelid - Segmentation, Setae, Metamerism: The body of an annelid is often described as a tube within a tube The body form of polychaetes varies, depending on whether the polychaete is free-moving, sedentary, or pelagic (ocean-dwelling)
  • Nervous system - Annelids, Reflexes, Sensory | Britannica
    Nervous system - Annelids, Reflexes, Sensory: The brain of most annelids (phylum Annelida; segmented worms, including the leeches and terrestrial earthworms) is relatively simple in structure The earthworm brain is a bilobed mass lying above the pharynx in the third body segment Sensory nerves leave the brain and run forward into the prostomium (extreme anterior end) and first segment The
  • Annelid - Nerves, Segmentation, Cephalization | Britannica
    Annelid - Nerves, Segmentation, Cephalization: The nervous system of free-moving polychaetes consists of a dorsal brain, the ventral subesophageal ganglion, and paired nerve cords with one ganglion per segment The polychaete digestive system is generally a straight tube; a mouth leads into an esophagus, which is followed by the intestine and the anus
  • Animal reproductive system - Annelids, Mollusks, Reproduction | Britannica
    Animal reproductive system - Annelids, Mollusks, Reproduction: Annelids have a well-developed body cavity (coelom), a part of the lining of which gives rise to gonads In some annelids, gonads occur in several successive body segments This is true, for example, in polychaetes, most of which are dioecious Testes and ovaries usually develop, though not invariably, in many body segments; and
  • Cobalt | Uses, Properties, Facts | Britannica
    Cobalt, metallic chemical element, one of the transition elements, atomic number 27 The metal is used especially for heat-resistant and magnetic alloys A relatively large percentage of the world’s production goes into magnetic alloys such as the Alnicos for permanent magnets
  • Velvet worm | Invertebrate Anatomy Adaptations | Britannica
    Velvet worm, (phylum Onychophora), any of about 70 wormlike species of ancient, terrestrial invertebrates with short, thick legs and a dry, velveteen body Onychophorans range in size from 14 to 150 mm (about 0 6 to 6 inches) and are found in rainforests Unable to control water loss, they cannot
  • Renewable energy | Types, Advantages, Facts | Britannica
    Renewable energy, usable energy derived from replenishable sources such as the Sun (solar energy), wind (wind power), rivers (hydroelectric power), hot springs (geothermal energy), tides (tidal power), and biomass (biofuels) Several forms have become price competitive with energy derived from fossil fuels





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