Luke is interested in his family's history, so he drew his family tree. Luke knows that a person's physical characteristics are carried in their genes. Approximately what percentage of genes did Luke get from his Grandma Mary? A. 50% B. 100% C. 25% D. 0%

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

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

How does central place theory explain patterns in the size and distribution of cities?