This question was originally intended to ‘ lose ones-self in meditation to the wonders of life’ But scientifically – the answer is tree (and here’s why).
The organisms we see today after millions of years of evolution are here because they evolved the function of reproduction. The seed is simply the trees method of reproducing (the seed itself cannot be the first because it is dormant until conditions are favorable).
However the tree is actively living so thus it is the latest of its species as it evolved from its ancestor species (who managed to reproduce through-out evolution).
Therefore the noteworthy question becomes – what was the tree before it was a tree (it was some other living organism capable or reproducing itself)
OMICS 