We are looking beyond as to what was being written. The Qur'an is not trying to predict/or state for you a scientific principle/miracle, it is just mentioning a natural occurance for you to ponder over - i.e. how humans/animals seem to be in pairs (male/female).
It was known in ancient times that there were pairs in the human and animal worlds. Later on man learnt of pairs in trees and plants.
In comparison, take the verses of Surah Ar-Rahman:
Quote:
There in are fruits and palm trees with sheaths.
And grain with husk and fray. rant flowers.
Which then, of the favours of your Lord wills O Jinn and men you twain will deny?
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It states natural phenomena's, as favours that you should ponder over. Is it not taught, that he could have made the rain bitter if he willed?
Take the Qur'an in context, you don't have to see everything in a scientific sense. Their are many metaphoric, or simple literal meanings (as in this case) - which people are looking too much in.
An example would me saying the chair is red - but you argued it somewhat resembles maroon - you are missing the point

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