Does anybody know the answer to this question I been on it for 15 mins somebody please give me the real answer

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.

Monitor and apply fix up strategies

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.