How many of theese objects are likely to have an area less than 1 acre?

It's impossible to tell.  You haven't told us anything whatsoever
about the objects ... not even WHAT they are.  We don't know
whether they're cells, football fields, continents, planets, or galaxies.

Is there any chance that maybe, just maybe, the list of objects is
right there with the part of the question that you copied and posted,
but you felt that we could answer the question without knowing what
they are, so you didn't bother posting the list ?