Answer:
The pancreas produces the hormone insulin that is responsible for carrying sugar from my body to the cells for use. It has been shown that obese people will have a high incidence of diabetes, therefore it is advisable to lose weight and have a proper diet.
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The opportunity cost of spending more money on finding a cure for heart disease is the money that needs to be taken out of funding to find the cure for other diseases.
Depend on what you mean by what kind of competition, if you talk about competition for food, some bird population may be getting smaller and have a hard time to reproduce because they can't get enough food for themselves.