By contracting, muscles pull on bones and allow the body to move. Muscles can only contract. They cannot actively extend, though they can move or relax back into the non-contracted neutral position. Therefore, to move bones in opposite directions, pairs of muscles must work in opposition
B below
The hypothalamus is located at the bottom or below the thalamus. The name hypo means below or at the bottom. Hypothalamus is an organ reponsible for maintaining body temperature, regulating bodily hormones and basic drives such as sex, hunger and thirst. The organ is part of the limbic system which has a role on emotions and memory.
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a, because exercise doesn't just aid the prevention of certain diseases, it helps prevent many diseases. i would've chosen d if it wasn't so specific but a is the correct answer.
