E MICHAEL WITE RESPONDS:
No, that was not necessary either, besides things like lily pads, in a world wide flood you are going to have millions of things floating in the water that things like insects could have survived on.
Fallen trees, branches, twigs, leaves, fruit, vegetables, dead carcasses.
And tussocks that are floating islands not attached to any land mass. Large tussocks can be acres in size, with trees 8 inches in diameter growing on them.
A Small TUSSOCK
A large Tussock