You’re a geologist who is about to stake claim to a diamond deposit, but first you need to know the age of the metamorphic rocks in the area. In your lab, you measure headsium and tailspin in the metamorphic rock/fossil sample and discover that one eighth of the headsium remains. 1) how many half lives have passed?

2) if the half life of the headsium were 150 million years, how long ago did the fossil in the metamorphic rock die?? Show your work.

No links please.

What type of genetic drift would be simulated if all the beans that were not selected died out?

Cold case files recently began re-investigating an old murder case. the murder took place in the park; a young man, james, was hit over the head with a brick and killed. police suspected the jealous former boyfriend of james' wife, karen. whoever killed james may have washed their hands in a near-by bird bath as detectives found blood in the bird bath. since the murder took place before dna fingerprinting was available, the suspected killer, ronnie, went free. detectives are now reviewing the blood evidence using dna fingerprinting. based on the dna fingerprints of all possible suspects, who is james' killer?

Why do we perceive objects as retaining their brightness under different lighting levels?