A serve flood brings a lot of sediment and silt into the black river. The oxygen of the river decreases greatly. What is the r limiting factor?

oxygen

Explanation:

A limiting factor is any condition whose decrease, increase, absence or presence is able to limit/stop population growth. Examples of limiting factors include abiotic conditions (e.g., temperature, water, oxygen, CO2, etc) or biotic conditions (e.g., food, mate, etc). There are many aquatic species that require high levels of oxygen (e.g., fish), thus being it a limiting factor for these species.

Explanation:

This introduces the concept of mitosis and meiosis in the form of a Leukemia case study. Cell division is the process in which one cell, called the parent cell, divides to form two new cells, referred to as daughter cells. Mitosis actually occurs in four phases: prophase, metaphase, anaphase, and telophase.