Paleontology is the study of the history of life on earth as based on fossils.
If a p53 gene is defective it may cause cell cycle to stop functioning normally. Without this cell cycle check, cells will divide continuosly creating many chromosomal damage.
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The ozone layer is still here I believe, it's just slowly going away due to our pollution of the air and such :/
Explanation:
Please vote brainliest!
