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Ms. Arness Name: TEACHER NOTES Block: Biology 11 Date:
PHYLUM PORIFERA
This phylum represents the first experiment in multi-cellularity for animals
There are specialized cells, but they do not work cooperatively together – they’re not tissues
Simplest and most primitive animals
Have changed little since they evolved
Have radial symmetry
Are sessile
Sponges have spicules between their cell layers for structural support
Many sponges also contain a collagen material called spongin
This is what makes bath sponges from certain species
Nutrition: Filter feeding
Reproduction:
Asexual: budding via gemmules
Sexual: internal fertilization (larva, sperm and egg)
Respiration, circulation and excretion: water
Water Flow Animation!
Go to website: http://www.biology.ualberta.ca/courses.hp/zool250/animations/Porifera.swf