Answer:
The big thing is that, in countries with high life expectancy, their old people are more likely to feel engaged. This can be a cultural difference, or it can be geographical; old people are more likely to do things if they can physically get around.
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Being manipulated by their partner (verbally, emotionally or physically), mental illness, not leaving the relationship when the warning signs occur, not telling anyone about their relationship for advice
The soluble products of the digestive system (i.e.glucose) are moved into the circulatory system and transported to organs to perform a function (i.e. muscles for respiration)