Hello there. I am a non-scientist in search of some answers. I wholeheartedly accept evolution as science fact. Those more learned on the subject than I have assured me that it happened entirely apart from an intelligent designer and I take them at their word. So I am not "one of those," but I am having some trouble wrapping my head around a few particulars about evolution.
1) How exactly did single-celled organisms evolve into multi-celled organisms (complex organisms?)? I can't wrap my head around this question. Presumably there was a "first," complex organism, how did this creature make the transition if evolution is such a gradual process.
2) How did organisms evolve to reproduce sexually? That is how did natural selection favor sexual reproduction when there was, obviously, no precedent for it? Did a creature exist at one time that could reproduce both sexually and asexually? Do such creatures still exist?
Thank you in advance for your answers.