The appearance of fossils would the the answer.
Although there has been some scientific debate about what fossil strata should mark the beginning of this period, the "International Geological Congress" determined that the Cambrian period was approximately 543 million years ago of which the first appearance in the fossil record of worms that made horizontal burrows was discovered.
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Answer:
D- Iron
~+lil more info!+~
Iron is the ultimate nuclear “ash,” from which no nuclear energy can be extracted.
Answer:
Stablising
Explanation:
Bcoz they acquiring mean character
