What was the seed of evolution composed of, and how was it planted?

Excellent questions.

For the origin of matter - yes, the current best-accepted explanation for the beginning of the universe is the Big Bang (where everything was compressed into a singularity which then expanded rapidly, as you say). But this theory doesn't explain where that singularity came from; in fact, it doesn't even try.

Sadly, science cannot currently answer that: the singularity's origin (if any) was obviously "before" our universe - and the laws of physics which science uses and understands do not operate "outside" or "before" our universe. So we cannot hypothesise what the conditions were.

Though one thing we do know within our universe is that subatomic events can and do happen without cause: subatomic phenomena do just "appear" out of nothing. Since the singularity was just such a subatomic phenomenon (a point of zero volume), it is possible that it too happened "just because".

For the origin of life - the original common ancestor which evolved into all life on earth, we actually have a slightly better idea (though the field - "abiogenesis" - is still hotly-debated and controversial). We have a pretty good idea of what the conditions on pre-life earth would have been like, and experiments (most famously the Miller-Urey experiment) have shown that those conditions are capable of forming short biological molecules (oligopeptides, oligonucleotides, lipids, etc.).

It is thought that one such molecule - probably a short RNA molecule - was capable of autocatalysis (making copies of itself, as RNA is capable of doing), and that this self-replicating molecule was the first "life". Read the wikipedia article on abiogenesis and the "RNA world" hypothesis for more information.

It began with chemicals at first. Some of the basic building blocks exist naturally, as we have seen in meteorites that landed on earth, and around some of the natural "chimneys" or "smokers" at the bottom of the oceans where magma comes close to the surface of the crust. There where it is very hot, it the salt water, there must be carbon (the basic atom which is the building block of all life) and several other molecules including oxygen and hydrogen (these last two are what water is made of) and some other things. I don't want to get too technical in such a small space, but the four bases which comprise the DNA molecule are adenine, guanine, tyrosine, and one other which escapes me at the moment. I'm sure you can look it up. But even this was not the very first form of life. Before there was DNA, there was RNA, just the naked "template" if you wish to call it that. There still are very simple forms of life like this, which we now call "retroviruses." Nowadays they infect the cells of other organisms in order to reproduce. But in the beginning they could only come into existence very, very slowly, essentially by chance. Before this year is over, there will be a new book out on Amazon which will explain all this in great detail. It will be volume I of a series entitled "The Human Journey" and it will be subtitled "Chemical Evolution."

Volume 2 will explain how life developed from this very simple beginning to the very single-celled life forms and it will come out shortly volume I does. The author of both these books is Robin S. Heyer, a very old and dear friend of mine. The whole series is to be 10 volumes in all, the last covering the last 10 thousand years of human existence since the Neolithic Revolution (when agriculture began).

The only one of the series that is out just yet is the one I wrote, which has the series title, but for some reason the subtitle did not appear (Human Evolution), but will be corrected in the 2nd edition. Basically, it takes mutations, which appear randomly in the RNA and later in the DNA, to make changes in the first forms of life, so that others evolve from them. When the changes are advantageous, they are passed on to offspring. When the changes are disadvantageous, the organism dies and the change is not passed on. This took a very long period of time, approximately four billion years.

Life didn't likely need a push start. It didn't, even though many scientists have suggested, start with molecules as complex as DNA or proteins. It is much more rational to assume that some sort of self replicating chemical system was how it started. Those early forms eventually evolved RNA, DNA and proteins which erased all the earlier forms.

are you asking where the materials in the big bang came from? or where the materials for life on earth came from? "Evolution" pertains to a living things adaptation to a changing environment.

God was playing with the Chemistry Set that he had received on his Birthday, when all of a sudden there was a loud explosion...

Subsequently, his parents made him flush this disaster down the toilet!

...and here we are!

simple..it was composed of love and planted with forgiveness...