If you found an index fossil in a layer of rock in Utah and a similar fossil in a layer of rock in England, you would know what? 1. That the surrounding rocks are not similar

2. That the fossils are different ages.

3. That the continents could have been together at some point in the Earth's history.

4. You would know the ages of the fossils were the same.

Its trait is different and it the organism survive

Answer(false);

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.