In both cases you need the reflexive pronoun.
Quote:
1)The bacteria are very small.
That's why they pass through very fine filters.
a-The bacteria are so small that they pass through very fine filters
b-The bacteria are so small that pass through very fine filters
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The first is correct. The second is not. What is so small that it passes through very fine filters? Bacteria. "They" refers to bacteria.
Quote:
2)The country has many natural resources.
That's why it can support itself easily.
a-The country has so many natural resources that it can support itself easily.
b-The country has so many natural resources that can support itself
easily
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The first is correct. The second is not.
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