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According to the keyed answer, the hydrogen bond is weakest.
Editor note: mixes bond types; options left unchanged.
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After oxygen, carbon (~18%) is typically second by mass.
Hence the keyed answer is Carbon 18%.
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According to the keyed exam answer, head reflexes are controlled by the spinal cord.
Editor note: cranial reflexes involve the brain/brainstem; options left unchanged.
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The spleen stores blood and filters blood cells.
So the correct answer is Spleen.
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Water's high specific heat capacity lets it absorb much heat with little temperature rise.
Hence the keyed answer is Water has very high specific heat capacity.
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Incompatible transfusion makes red cells agglutinate (clump).
So the correct answer is The RBCs agglutinate.
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