The correct answers are ATMOSPHERE and BIOSPHERE. Nitrogen is most abundant in the ATMOSPHERE, but nitrogen can't be absorbed by the BIOSPHERE without the help of a special bacteria and without undergoing a process called nitrogen fixation.
Domain - kingdom - phylum - class - order - family - genus - species
1.Animal Cells : During cytokinesis, the cytoplasm splits in two and the cell divides. In animal cells, the plasma membrane of the parent cell pinches inward along the cell's equator until two daughter cells form
2.Plant Cells: During cytokinesis, the cytoplasm splits in two and the cell divides. In plant cells, a cell plate forms along the equator of the parent cell. Then, a new plasma membrane and cell wall form along each side of the cell plate.
3.The cell cycle, the process by which cells progress and divide, lies at the heart of cancer. In normal cells, the cell cycle is controlled by a complex series of signaling pathways by which a cell grows, replicates its DNA and divides. This process also includes mechanisms to ensure errors are corrected, and if not, the cells commit suicide (apoptosis). In cancer, as a result of genetic mutations, this regulatory process malfunctions, resulting in uncontrolled cell proliferation.