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HPE (health population and the environment) is a multidisciplinary subject

Explanation:

Multidisciplinary mean from different disciplines but working together. In education or academia health, population and environment have different origins but when combined together make a multidisciplinary subject. Health is an important discipline in our lives but environmental factors also influence our health. Similarly, social factors like more population impact the environment. So HPE is a multidisciplinary subject and these three disciplines are interconnected somehow because we can not just study the environment without considering the effects on people or vice versa.

since you have not provided the options here i   am going to give you general overview about hormone.hormone are actually the part of endocrine system in our body and produced by the endocrine glands. the hormones act like a chemical messenger   within human body. once produce by the glands they   travel through the blood stream and reach at specific or target tissue and organs   which result in control of our body function. the hormones are specific in their work and work on only the targeted tissue or organ   . with the of hormone endocrine system regulate the heart rate , metabolism, our mood and   growth as well as the development and even the sleeping cycle etc. they actually are the messenger for body cell and organs .