The theme is the writer's view of or comment about the subject. The answer to your question is D. I hope this is the answer that you are looking for and it comes to your help.
Leptin hormone is the hormones which appears to be designed to protect the body against weight loss.
Leptin hormone is secreted from fat cells and it helps to regulate body weight. Leptin hormone is predominantly made by adipose cell that help to regulate energy balance by inhibiting hunger. leptin hormone is opposed by the action of the ghrelin hormone which is a hunger hormone/
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3.Fitness is related to whether an organism's adaptations result in more offspring
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20, Im not completely sure tho
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Answer: Metalloid and non-metals not only form covalent bonds by sharing, but can form ionic bonds either by losing or gaining electrons
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