Well, we don't understand God's ability to explain the unknowable to Adam and Eve.
He is capable of that you know.
Before they actually died -
Genesis 3:19 In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return.
Bugs - we don't know if there as a specific number of bugs made which wouldn't die.
And/or we don't know the dynamics of reproduction before the sin of Adam.
whether reproduction stopped after the commandment was filled to "fill the earth".
Plus scripture -
Romans 5:12 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
Romans 8:22 For we know that the whole creation groaneth and travaileth in pain together until now.
So in other words, no explanation, no evidence. God of the Gaps fallacy.