The deepest earthquakes occur in areas of normal polarity in areas of reversed polarity farther away from a trench closest to a trench

On a floor there are several 1-4 mm elongated drops leading away from a body lying in a pool of blood. the the forward wall there is a sigzag pattern and on the walls to the right side there is a linear patter

Ascientific idea becomes valid when it is what?

Using meiosis, the sporophyte produces spores that are .