The hormone, increases the blood calcium level and decreases the blood calcium level.

calcitonin

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parathormone

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thyroxine

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melatonin

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melanin

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Solution

The correct options are
A calcitonin
B parathormone
Parathormone is secreted by the parathyroid gland. It increases the blood calcium levels by increasing the reabsorption of calcium from kidneys and decreasing calcium deposition on bones.
Calcitonin, secreted by thyroid gland decreases the blood calcium level by increasing bone absorption of calcium.
They work together to regulate the blood calcium levels.

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The hormone which increases the blood calcium level and decreases its excretion by the kidneys is

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