7. A student thinks that the human body only works properly when cells are getting molecules from food and molecules from air. Is the student correct?

Yes, the body only works when cells get molecules from food and molecules from air

Explanation:

The Body works in different ways and it entirely dependant on the physiological or psychological functions of body systems. The body carries out its cells' functions. Food is very vital to the body as it gives energy that is needed for body growth and development. The air and its particle we breath is needed also to ensure the growth and devel. The food contains essential nutrients that is needed by the body to function properly.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.