Has there been enough time on earth for life to have developed (prebiological evolution)?

Answer 1

Evidently, since we are here. Life has existed on earth for nearly 4 billion years. As life evolved, it has become more complex and the formation of biological systems has also evolved.

Answer 2

Nice example of circular reasoning there, Misoma5.

This is an interesting question. The trouble is, we cannot go back in time to make any scientific observations about the Earth in pre-biological times, so our deductions about the types of chemistry that went on at that time are based on a whole lot of assumptions. Was the atmosphere acid or alkali? Oxygen-rich or hydrogen-rich? Was there a "primeval ooze" in which the first organic molecules were formed in reactions initiated by lighting strikes or around deep-sea "chimneys" warmed by geothermal vents? Was there even a sea at that time?

We don't know the answers to any of these questions for sure. We can only speculate on the possibilities.

Likewise, geological dating of rocks and fossils is also based on circular reasoning and assumptions. We assume that the rate of decay of certain radioactive isotopes has always been the same. We assume a certain concentration of that isotope in the rocks to begin with. Based on those assumptions, we calculate the age of the rocks. And date the fossils found in them. And in different rocks, we base the age on the type of fossils found therein. There are no absolute measurements.

So the answer to your question is - it is impossible to know, until we develop a time machine.

Answer 3

The first signs of life are about 3.5 billion years old. (Sources provided.) The oldest rocks found place the age of the earth at about 4.6 billion years old.

That leaves about 0.8 to 1.1 billion years for the first life forms to have evolved. That's a *LOT* of time.

That appears to be enough time. But until we know a comprehensive theory for how this life started (there are currently several, equally plausible candidates), there is absolutely no way of estimating how long this would have required.

In fact a billion years may have been enough time for life to have started (and died out) *several* times.

{edit}

LITTLE_JOHN wrote:

>"may i add that if i was to believe in evolution.......it would for only 1 group of people........
THE POLITICIANS"

... There's another group of people ........
THE SCIENTISTS

Over 95% to 99.89% of SCIENTISTS accept evolution.

Answer 4

interesting question in that all life on earth is related and uses DNA & ribosomes to build proteins. so the smallest bacteria & humans can be considered the same life form & their relationship can be traced through dna,we are more closely related to yeast than to grass for instance but are still related.
no other form of life has ever been discovered eventhough we have looked more than a mile deep in solid rock & in thermal vents on the sea floor.
we discover life anywhere we look but it is always based on the same dna,ribosome system as the rest of us.
viruses do not consume energy or nutrients & a virus cannot produce another virus so are identical to a computer virus & are not alive.
life first appeared on earth about 500 million to 1.2 billion years after the planet formed(& maybe in as little 50 million years after it had a more or less permanent surface) so there has been plenty of time for many other forms of life to develop but no evidence of any other lifeform has been discovered although we know of several other systems than ours that life could theoretically operate/function. one that uses liquid methane instead of liquid water for instance.
hopefully we will find another life form someday perhaps on or in one of the satellites of the larger planets.
lonely aint it!

Answer 5

No. That's why these people keep increasing the amount of time since the universe began. It's just another way to lend credibility to their story.

51% of chemists say that the cell could not have evolved. And I've read accounts from other scientists who personally don't agree with evolution, but keep silent because there's so much pressure to believe.

My best friend is in med school to become a neurosurgeon, and he has NEVER believed in evolution, even for a minute. I used to believe in it, because I was fooled by my high school textbooks. But after examining the evidence for myself, there is no way that I believe in evolution.

Answer 6

life was a creation.............God's creation.........

evolution theory has defeated itself....
if people evolved, then why are there still all the animals and germs in the world today?
look around you. nature itself teaches that there was, and still is , a CREATOR.

if the human bodies was similar to that of animals, we could feed on the same as they. also we would have much of the animal's characteristics.

final proof that humans did not evolved from animals is .......
ANIMALS ARE SMARTER THE MOST PEOPLE.

may i add that if i was to believe in evolution.......it would for only 1 group of people........
THE POLITICIANS