The Scyphozoans are commonly found in Florida and hang upside down in the water with their tentacles pointed towards the surface. They do this in order to provide light to the photosynthetic dinoflagellates housed in their bodies. What are they

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thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.