How should we keep bee products​

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

What factors influenced brazil's current and future economic strength?