Which is the point of concurrency of the altitudes of a triangle?

Which is the point of concurrency of the altitudes of a triangle?
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orthocenter
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People living in high altitudes (like mountains) usually have a -----? A. smaller number of Red Blood Cells B. larger number of Red Blood Cells (Answer) C. smaller number of White Blood Cells D. larger number of White Blood Cells

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__________ variety of apple is reported to perform well at lower altitudes. a. Enna b. Amri c. Diana d. Golden Delicious

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Basophilic prokaryotes (a) grow and multiply in very deep marine sediments (b) occur in water containing high concentrations of barium hydroxide (c) readily grow and divide in sea water enriched in any soluble salt of barium (d) grow slowly in highly alkaline frozen lakes at high altitudes.

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