4. Where do spore cases reside on ferns? A on fern flowers
C. on fem roots
B. on fern stems
D. on fern leaves (fronds)

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D. on fern leaves (fronds)

hope it's help

D. on fern leaves (frondes)

Hope it's help you

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.