Please help me with the answers I need help

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Which process of living things produces water that enters the water cycle