In this wetlands ecosystem, the is/are an important abiotic factor that could limit the underwater organism populations. a) dissolved oxygen b) number of predators c) number of plant species d) migratory bird population

A). dissolved oxygen    

Dissolved oxygen is the abiotic factor. Abiotic factors are the non-living components of the environment which can have an influence on the living organisms. Abiotic factors include soil, water, oxygen, temperature etc.

The underwater organism population gets oxygen from aquatic plants which produce oxygen by the process of photosynthesis. Therefore, oxygen is available in the dissolved state in water called as dissolved oxygen. Respiration by underwater animals and plants , decomposition and other chemical reactions requires oxygen. Utilization of dissolved oxygen by underwater animals can limit the overall concentration of dissolved oxygen which can affect the vital metabolism of underwater animals and therefore can limit their population.

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle