Question

in the term substrate, which word element is used because it means to spread out?
o -strat
o -ate
o sub-

Explanation:

The word - strat in substrate is related to spreading out as it is associated with layers which implies spreading or extending in a flat - like manner. The prefix sub - means under, and the suffix - ate is often used to form verbs or adjectives and doesn't mean to spread out.

Answer:

O - strat