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simple invertibrates
sponges
Term | Definition |
---|---|
invertibrates | animals without backbones |
bilateral symmetry | a body with 2 similar halves |
radial symmetry | body parts arranged in a circle around a central point |
asymmetrical | animals without symmetry |
ganglia | dozens of nerve cells that come together in groups |
nerves | fibers that carry signals to control the movements of their body |
gut | a pouch lined with cells that release powerful enzymes |
coelom | a space in the body for the gut and allows the gut to move food without interference from the movements of the body |
sponges | the simplest animals, no symmetry, no head or nerves or gut, move really slow, collar cells filter food, in the phylum Porifera, live in the ocean and come in beautiful colors and a variety of shapes |
Cnidarians |