Abnormal conditions due to the absence of specific substances usually found in a normal diet

Question

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$$\ 1) Deficiency~ disease$$

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$2$) Susceptible to infection, partial or complete blindness, unhealthy skin-$Vitamin ~A ~deficiency$

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$3$) Fatigue, depression, irritability, low blood pressure, loss of appetite-$Vitamin ~B1 ~deficiency$

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$4$) Inflammation of the mouth, sores around the mouth, red and thickened skin, diarrhea, vomiting, etc.~$Niacin~ (B3)  ~deficiency$

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$5$) Weakness, bleeding into tissues, excessive bruising, softening of bones~$Vitamin ~C ~deficiency$

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$6$) Bones not normally hardened and become bent or twisted~$Vitamin ~D~deficiency$