How is the nucleus the “command center” of the cell?

What are the two main phases of a cell cycle

Cells destroy body cells infected by a virus or bacteria.

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils