do bugs like flies and ants have lungs?

Answer 1

Some bugs like flies. Assassin bugs are predatory insects of the Order Hemiptera (the 'true bugs'), and many will eat flies if given a chance.

Ants don't have lungs though. They obtain their oxygen through a system of trachea which directly connect their tissues to outside air through holes in their sides called spiracles. Because insects are small enough, the oxygen can diffuse directly into the tissues. It is one of the things which limits the size that insects can reach.

UPDATE: Ahh!! Calimecita's reading of the question makes waaaaay more sense than what I read. Honestly, this was a total failure of comprehension on my part, and I wasn't trying to be a sarcastic smartass (for once). I honestly read it as two separate (and somewhat bizarre) questions.

Answer 2

As usual, Haysoos' answer is great.

I think, however, that the question as it was formulated is confusing, and that you meant "flies and ants" as examples of "bugs".
If that is the case, what Haysoos said about ants applies to flies too.
Here's some information and pictures of the tracheal system:
http://io.uwinnipeg.ca/~simmons/lb7pg6.htm

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EDIT: I'm sure if the Asker comes back, she'll understand perfectly. And I hope she doesn't pay attention to the Thumbs Down we've both received and picks your answer, Haysoos :-)

Answer 3

Not as you would think of lungs. They mostly use passive breathing. They simply absorb air from the atmosphere. It is very similar to the way fish obtain oxygen, only insects have better protection from losing moisture.