Examlex
The basic social unit during the Paleolithic Age was the ____________________.
Carboniferous
A geological period approximately 359 to 299 million years ago, characterized by the widespread presence of coal-bearing deposits.
O2 Levels
The concentration of oxygen in a given environment, crucial for the respiration of most aerobic life forms.
Half-Life
The time required for a quantity to reduce to half its initial value. In the context of radioactivity, it’s the time it takes for half of the radioactive atoms in a sample to decay.
Radioisotope
Isotope with an unstable nucleus.
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