Identify the structure of the human heart which is a muscular chamber that pumps blood out of the heart and into the circulatory system.
a) atrium
b) ventricle
c) coronary artery
d) pulmonary artery

well we can't tell you because we cant see the time give a screen shot or something.

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.