Chp. 22 bio Word Scramble
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| Question | Answer |
| fossils | are perserved remains of past life on earth. includes bones, shells, and footprints. |
| Radioisotope dating/ carbon dating | method used for estimating the age of the fossil |
| hlaf-life | is the amount of time required for a radioisotope to decay to half of its initial amount. |
| Earth is estimated | to be 4.55 billion years old. |
| Life began on earth | between 3.5-4 billion years ago |
| Prokaryotic cells around | archaean eon - 3.5bya |
| Eukaryotic cells aroused | about a billion years later. 2.5bya |
| Multicellular eukaryotes appeared | another billion years later. 1.5bya |
| cenozoic era is | present day |
| RNA world | rna is ancient molecule, scientist favor rna as most permitive oldest. 1. ability to store info. 2. self replicate 3. enzymatic function ribozymos. |
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