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Anthropogenic disruptions such as clearing vegetation or tilling the soil cause a variety of localized changes; common effects include an increase in the amount of light reaching ground level and a reduction in the competition among organisms.
C) dating usually want to know about the radiometric dating methods that are claimed to give millions and billions of years—carbon dating can only give thousands of years.
Domesticated plants and animals have been (and continue to be) raised at scales ranging from the household to massive commercial operations.
This article recognizes the wide range of activities that encompass food production and emphasizes the cultural factors leading to the creation of domesticated organisms.
One rare form has atoms that are 14 times as heavy as hydrogen atoms: carbon-14, or C ratio gets smaller.
So, we have a “clock” which starts ticking the moment something dies.