Ameteorite was found to contain 40 argon-40 atoms for every 10 potassium-40 atoms. the half life of patassium-40 is 1.25 billion years. assuming no loss of daughter isotopes, how old is the moon rock?

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

Which is a function performed by stem cells in the skin a. replacing lost skin cells b. making cells for the intestines c. growing new organs d. differentiating into brain cells plz apex

Several billion years ago which gas was the least prevailant in the atmosphere