I think this is true due to the fact If something was to happen someone on the outside would know the plan of action.
Answer:
In the period from 1450 to 1550, Northern Renaissance was focused more on the empirical observation and accurately paying attention to details of visual reality. The Italian Renaissance, on the other hand, accurately portrayed visual reality through proportion, perspective, and human anatomy. Italian Renaissance artists depicted mostly classical mythology, while Northern Renaissance artists portrayed more of the domestic interiors and portraits.
UltraViolet rays is a type of radiation emitted from the sun that can be both beneficial and damaging to humans
Because UV from the sun contains Vitamin D, increase energy and mood. However standing in IV light for too long can cause skin and eye damage because of the amount of radiation it contains and the fact that it has a wavelength of 320-400nm
I'm almost sure that the term is a directory.