Solve this:
 
Microorganisms are widely distributed in  
nature found almost everywhere. (a).......
They were the first appear on earth. (b).......
They are innumerable and small (c).......
that cannot be seen with the (d).......
naked eye. If object has a (e).......
diameter of less 0.1 mm, the eye (f).......
cannot perceive it at all. The  
existence this microbial world was (g).......
unknown the invention of microscopes.  (h).......

Dear Student,
Assuming this is an omission question, the probable answers are given below.

a) nature and found
b) first to appear
c) and so small
d) that they cannot
e) if an object
f) less than 0.1
g) existence of this
h) unknown until the

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