D. 99% of all living things that have ever existed are now extinct
Spherical shaped bacteria are known as coccus bacteria.
The answer to your question is alkanes
It proves that living organisms MUST come from other living organisms, an egg couldn't magically appear in a pile of chicken seed, a hen would have had to lay the egg first, just as a nucleoulus makes ribosomes so the cell can have proteins, the proteins don't just materialize within the organism.