Answer:
Option 3, Chromatids remain attached to one another until anaphase
Explanation:
Centromere lies at the center, end or other points of the chromosome and joins the two sister chromatids. During cell division, the spindle fibers attaches at the centromere and detaches the chromosomes during the anaphase of the cell division to ensure that each daughter cell gets equal number of chromosomes at the end of mitosis. Centromere plays an essential role in the separation of chromosomes.
Hence, option 3 is correct
Phagocytosis. This involves the complete engulfing of a extracellular particle or cell to form a intracellular phagosome. The phagosome then fuses with a lysozome to form a phagolysozome. The lysozymes in the phagolysozome digest the particle or cell (this case Paramecium). The other type of endocytosis is called pinocytosis.
The size of the predator population keeps the prey population in check. Without the predators, the prey population would get out of hand and begin overpopulating.