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Cnidarians

Cnidarians. Soft-bodied, carnivorous animals that have stinging tentacles arranged in circles around their mouths. Simplest animal to have body symmetry and specialized tissues. Examples: Sea Anemones, Jelly Fish, Coral . Sea Anemones. Jelly Fish. Coral. Environment Aquatic Ecosystem

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Cnidarians

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  1. Cnidarians Soft-bodied, carnivorous animals that have stinging tentacles arranged in circles around their mouths. Simplest animal to have body symmetry and specialized tissues. Examples: Sea Anemones, Jelly Fish, Coral

  2. Sea Anemones

  3. Jelly Fish

  4. Coral

  5. Environment • Aquatic Ecosystem • Need specific temperature, water depth, and light intensity • Mutualistic relationship with algae • Suffering from human activity and pollution Food Source • Through mouth to the gastrovascular cavity. • Only have one opening in their body (food enters and waste leaves through the same opening) • Digestion happens as both extracellular (outside the cells) and intracellular (inside the cell).

  6. Maintaining Homeostasis - Internal (Circulation, Respiration, Excretion) • Nutrients transported through body by diffusion • Eliminate wastes of cellular metabolism by diffusion through body walls Maintaining Homeostasis - External (Response) • specialized sensory cells called nerve net gather information from stimuli

  7. Movement • Hydrostatic skeleton- 2 layers circular muscles and a layer of longitudinal muscles Reproduction • Sexually and Asexually • Polyp reproduce asexually through budding • Sexual reproduction by external fertilization (outside the female’s body) • Evolutionary Milestone • Tissues (groups of specialized cells working together)

  8. Vocabulary: • Gastrovascular Cavity p671 • External Fertilization p672 • Page 670 Figure 26-12 or picture below:

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