43,2. You find the answer by doing 5.4ft • 8 minutes
An important tool in understanding the actual numerical dates of past geologic events is radioactivity.
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Substinence farming is farming food that is just enough to live off of. You don't sell substinence crops.
Commercial farming is growing food to sustain you, and having enough left over to sell.
In both, you grow food and you keep some (or all) for yourself.
