What does the grid of horizontal lines on the map represent?

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.

What is the best-known carbohydrate?

Introducing minvasive species to an ecosystem results in an increase in biodiversity is it true or false