Metamorphosis is responsible for the difference.
The stage in mitosis or meiosis in which duplicated chromosomes line up along the equatorial plate of the spindle.
Yes,
The cell, or plasma membrane, serves as a selectively permeable boundary between the internal cytoplasm and the external environment. All cells are composed of a plasma membrane.
The cell wall is situated to the outside of the cell membrane, and mainly functions to prevent osmotic rupture. Many taxa employ a cell wall, although some function without one
