Which of these is not a defining characteristic of minerals a) hardness b) sharpness c) cleavage d)streak

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.

Anne, an intern in a microbiology lab, was observing the characteristics of various specimens of protists. match each specimen to the category of protist to which it belongs.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?