Scientist think that all of life on earth originated from which type of organism?

Answer 1

Good question. Some scientists think protazoa, some scientists think bacteria, some scientists think algae, and some scientists think some sort of single-cell organism that we haven't identified yet. One interesting concept to mull over though, is how did a cell form in the first place? What was the precursor to an actual cell?

Interestingly enough, I think it's hard to imagine that a parasite, one that can't exist easily without the cell's machinery to duplicate, would actually be the the ancestor, but I think a case could actually be made for a virus as well.

At any rate, there is no definitive answer, hope that explains some of the thoughts and theories though.

Answer 2

I think that it would be fair to say that we don't exactly know what the first thing alive was (which is true whether a creationist or a Scientist), however, assuming that you believe in Carbon dating (rather than that just being another "theory") then the oldest fossil that has been found to date are the pre-cambrian stromatolites. These have been (controversially) dated at 3.5 billion years old, which makes them MUCH older than any dinosaurs or other large multicellular animals.

Essentially there are a number of competing theories for the origin of life (primordial soup/extraterrestrial origin etc) and so there isn't a 100% accepted answer to this within science. On the other hand evolution is accepted by EVERY SINGLE reputable biologist. A creationist biologist can only exist (with any credibility) if they accept that God created life, but imbued it with the ability to change and adapt; or to put it another way, to evolve.

Answer 3

Single cell organisms.

Answer 4

they believe its from a lot of different single celled orangelles
that fused together because one cell engolfed the other
and that organelle learned to adapt and live inside

Answer 5

You are right when you say " They think ", because "they" still can't get beyond calling Evolution a " Theory ". They think life came from a one-celled amoeba. I find that too much of a stretch to believe. Just using pure logic, it makes more sense to say it was created.

Answer 6

prokaryote

Answer 7

MITOCHONDRIA