D. Herniated disks. It's always smart to be careful when playing sports or even just doing day to day activities. Those hurt!
The answer in the space provided is anemia. It is because anemia would likely cause other people who has a type of anemia experience a craving of iron or other objects as these are symptoms associated with it. That is why the person who has iron object cravings are needed to be tested if they have some sort of anemia, in order to identify what causes him or her to do it.
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I think imma go with 1) Neurological development
Answer:
According to Incentive theories there are two types of motivation - extrinsic and intrinsic. If you are driven by rewards in the form of outside objects like money, you would respond and utilize extrinsic motivation. If you are on the contrary, driven by internal rewards, like experience or joy from the process, you are likely to respond and utilize intrinsic motivation.
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