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So far scientists have not found a way to find the exact age of the Earth directly from Earth rocks because Earth's oldest rocks have been recycled and destroyed by the process of plate tectonics. Ancient rocks exceeding 3.5 billion years in age are found on all of Earth's continents
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Types of biological macromolecules
Biological macromolecule Building blocks Examples
Lipids Fatty acids and glycerol Fats, phospholipids, waxes, oils, grease, steroids
Proteins Amino acids Keratin (found in hair and nails), hormones, enzymes, antibodies
Nucleic acids Nucleotides DNA, RNA
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A
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During mitosis the chromosomes are being duplicated. which means the chromosomes that are formed during the mitosis is identical to its parents. during the mitosis, the cell udergoes 4 phases. prophase, metaphase, anaphase and lastly the telophase