dsister said:
I thought that by saying I don't accept macroevolution that it also implies that I don't accept that life has been around for a billion years.
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But it has existed for billions of years. We know the Earth is old enough to have supported life for billions of years, the evidence is overwhelming. And our best estimates based on available evidence point to life existing on Earth for at least 3.65 billion years.
All dating methods point to the Earth being ancient at about 4.54 billion years old. I think Potholer54 can explain the evidence behind age of the Earth better than I can...
Age of Earth video
And the age of life can be determined from the chemical record left by life in ancient rocks (chemical fossils if you will), and we find it to be about 3.65 to 3.8 billion years old (source). More recent life (as in the past few hundred million years or so) can be determined by a wide range of dating techniques.
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Also if you look at the DNA of many species and examine the similarities and differences to how they are related to each other (i.e. create an evolution tree), it will give you more than enough evidence that macro evolution has occurred many times.
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Besides, even if you believe that life has only existed for a few thousand years and you accept micro evolution, you must also accept that macro evolution must occur, even if it has not done so already (which it has).