Except that it is clearly meaning all living things. This includes plants, fish, aquatic insects, microbes. The whole mud ball.<quoted text>
In a given context,'everything' can mean everything in the categories listed.
It doesn't say that the waters will not harm the plants, or fish or insects or anything else. It says that God will wipe out everything. Just because he lists some specific life as an example to drive home the point. He wraps it up by making it all clear that he will only save that which is on the ark.