Lungs appear collapsed in the fetus because they are filled with amniotic fluid and they have never been inflated with air yet.
A virus, because it has a non-cellular structure.
Penumbra,<span> the Moon's faint outer shadow. Partial solar eclipses are visible from within the penumbral shadow.</span> And Umbra,<span> the Moon's dark inner shadow.<span> Total solar eclipses are visible from within the umbral shadow</span></span>
