Which of the following is a characteristic of science.

a. it cannot be repeated
b. it asks questions that cannot be tested
c. it is done by only one scientist at a time
d. it uses data and observations to make conclusions

The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?