9. Earth's crust and uppermost mantle form the O lithosphere
O asthenosphere
O hydrosphere
O atmosphere

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

The production of cells during mitosis into specialized function is recombination or differentiation

Mitosis creates two identical daughter cells from one parent cell creates four nonidentical daughter cells from one parent cell is the most common type of reproduction for bacteria is the process by which male and female reproductive cells are created