I would think that knowing prefixes and suffixes would come in handy if you don't know a word - you'd be able to decipher it's meaning by determining the meaning of it's prefixes or siffixes.
Is that the first question on your homework?
The prefix of "unlawful" is "un-" meaning not, and the suffix is "-ful" meaning full of.
The prefix of photosynthesis is "photo-" meaning light, and the suffix is "-synthesis" meaning putting together.
The prefix of the word "invariably" is "in-" meaning "not," and the suffix is "-ly" indicating that it is an adverb.
Yes, "ex-" is a prefix meaning "out of" or "external," and "-ic" is a suffix meaning "relating to" or "characteristic of." Therefore, "extrinsic" is formed by combining the prefix "ex-" and the suffix "-ic."
Unaware is a word. It contains the prefix un-, meaning not. But, unaware itself is not a prefix or suffix.
The prefix is "Re" (Meaning once again). There is no suffix.
"Un-" is a prefix that is commonly used to give the meaning of "not" or "opposite".
Yes, "recognizable" has the prefix "re-" and the suffix "-able."
The prefix is "a-," meaning "up" or "toward." The root is "loft," meaning "above." There is no suffix in the word "aloft."
The root of "incapable" is "cap," which means to take or seize. The prefix "in-" (meaning not) and the suffix "-able" (meaning capable of) are added to the root to form the complete word.
Yes, "in-" is a prefix meaning "not," while "-ly" is a suffix that changes an adjective into an adverb.