4 Characteristics Simplest of all animals Contain specialized cells but no other organization levelMost are marineSaltwater sponges are brightly coloredFreshwater sponges are small and dull green colorSize – 2 meters to 2 cm
5 Characteristics Porifera means pore-bearing Water enters through pores bringing in food and oxygenFilter feeders on planktonOsculum – large opening at the top where excess water leaves
6 Water Flow Through the Sponge WATER OUTWater Flow Through the SpongeWATER INOsculum
18 Sponge ReproductionSponges can regenerate (regrow) lost body parts through mitotic cell division (asexual)Sponges also reproduce asexually by budding
19 Sponge releasing eggs & sperm Sponge ReproductionSponges are hermaphrodites (produce both eggs & sperm)Sponges reproduce Sexually by releasing eggs & sperm into the water from the OsculumCross-fertilize each other’s eggsSponge releasing eggs & sperm
20 Surviving Harsh Conditions Gemmules are specialized buds made to survive harsh weather (hot or cold)Contain food, amebocytes, and a protective covering of spiculesReleased when a sponge diesResist dessication (drying out)Become adult sponge conditions become favorable
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