MEIOSIS

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Life Lessons

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 Life Lessons Quotes “And once the storm is over, you won't remember how you made it through, how you managed to survive. ... “I've never fooled anyone. ... “Attitude is a choice. ... “Don't be pushed around by the fears in your mind. ... “Instead of worrying about what you cannot control, shift your energy to what you can create.”
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Phylum - PORIFERA

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 Phylum- porifera  *  ( paros -  pore , ferre ~TO BEAR)      * Commonly called as " spongs ".     General characters  1 porifera  are all aquatic, mostly  marine few terrestrial .  2 The are. Sessile and sedentary & grow like plant.   3. BODY SHAPE : vase or cylinder like . 4 Symmetry:  Asymmetrical or radial.   5 The body surface  is perpforted .by numerous pores,  the ostia through which water  entous the body of one or more large opening .the oscula by which the water exist . 6 They consist of outer ectoderm & inner endoderm with an  intermediate layer of ,mesenchyme ; therefore diploblastic  7 mouth - absent , Digestion ~ intracellular  8  Excautory & respiration  organs are absent  9 contractile vacucles. Are present in some fresh water forms .  10 The sponges are monoecious .   Monoecious-‐》 present male and fem...
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Ecology/Inpotaance of Ecology

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