<span>Humans have an endoskeleton, whereas insects have exoskeletons.</span>
Hello there!
It would have to be C. Relaxation.
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The correct answer is A. stretch, warm-up, workout, stretch.
When you decide to start working out, the first thing you need to do is stretch your body - without it, your work out won't be successful. After that, you need to warm up your body so as to avoid any injury. After you finish working out, it is important to stretch again, to complete your session.
A, because if you know about hygiene, you can help prevent the flu. Ex: educating younger kids to always wash your hands after touching anything dirty, after using the restroom, and before eating.