Under certain conditions, it is possible to get more work out of a machine than you put into it. Please select the best answer from the choices provided

T
F

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.

When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome