Cytokinesis is the physical process of cell division, which divides the cytoplasm of a parental cell into two daughter cells. It occurs concurrently with two types of nuclear division called mitosis and meiosis, which occur in animal cells.
Cytokinesis, the division of the cytoplasm to form two new cells, overlaps with the final stages of mitosis. It may start in either anaphase or telophase, depending on the cell, and finishes shortly after telophase.
Because as of right now the over use of antibiotics will lead to the bacteria developing a resistance and eventually an immunity which is bad for obvious reasons
A heterogeneous mixture composes of non- uniform components, so the concrete would be the answer, because you can tell the components from one another.