"Seconds". This case involves a simple plural (no possessive, no acronyms, etc.), and so no apostrophes are involved. That applies to any plural - there should never be an apostrophe before the "s" in simple plurals.
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the correct spelling of a plural is opossum.
data is spelled 'des données' (fem., nearly always plural) in French.
The units for the denominator is minutes. Also, since the number in the denominator is to be omitted, the number of seconds (in a minute) are totally irrelevant.
The plural of abundance is abundances. It is a regular plural.
'Was' is 'saw' spelled backwards.