Quais são os produtos típicos da mata atlântica?

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

Which of the following areas has the highest population density?

Can someone answer all these questions i need it done by tonight. once again