The answer is D
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Answer:
Muscles work in pairs to move a bone.
Explanation:
Skeletal muscles only PULL in one direction. For this reason they always come in pairs. When one muscle in a pair contracts, to bend a joint for example, its counterpart then contracts and pulls in the opposite direction to straighten the joint out again.
Answer:
Iron is known for transporting oxygen in blood.
The kind of infection would be a fungus infection, since you mention thickening and discoloration of the nail.