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

Environment  Aquatic Ecosystem  Need specific temperature, water depth, and light intensity  Mutualistic relationship with algae  Suffering from human activity and pollution  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). Food Source

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

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)

 Vocabulary:  Gastrovascular Cavity p671  External Fertilization p672  Page 670 Figure or picture below: