Read about the preventative measures being taken in Africa. Review the information and write a brief essay about how the international community is assisting with AIDS prevention and treatment in Africa. (Help please!!!)

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

Based on what you know about the location of the earth in relation to the sun, why is this called the goldilocks zone in other galaxies?

Mosses, lichens and shrubs can be found where in russia? a.grasslands b.mountain regions c.coastal plains d.siberian tundra