Respuesta :
1 billion years ago. All of these radio active isotopes that have decreased their activity over the last 1 billion years would have been more active. That's most definitely organisms. A 1 billion years ago would have been exposed to more Earth related radiation.
We're not talking about the sun or the cosmic rays, but the Earth related radiation due to just hire activity of the radioactive elements that were present. Radio activity always decreases with time.
Brief explanation
Radiation is indiscriminate. All molecules of life can be broken by radiation, resulting in disease or death. The main difference between flora and fauna is that plants don't regularly circulate cells through their body, and therefore will not develop metastatic cancers; you will need to expose critical parts of their structure to kill these locally. In animals, exposing one piece of the body to radiation can cause a cancer that spreads and kills the whole.
We have to make a distinction in radiation: you can have radiation that has more energy per photon than is needed to break a so-called covalent bond that makes up molecules, or other radiation that has less energy than needed to break a bond. The first type is called "ionizing radiation", and if it is absorbed by anything that is built out of molecules, it will break these molecules apart.
Non-ionizing radiation is not very interesting: in extreme doses it may kill cells by over-heating them. Until here, everything is deterministic. This *will* happen. The rest really depends on the exact circumstances: what change happens to which molecule in what cell.
Learn more about Radiation
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