The solar system is considered a natural system because it was made and controlled by natural forces, meaning, it was never influenced with human creations. It is considered as one of the products of the phenomenon of the physical world. Hope this answer helps you.
The sequence of events in meiosis I is first 'chromosomes condense and crossing over occurs', second 'paired homologues align at the equator', third 'chromosomes are pulled to opposite poles', fourth 'separated homologues cluster at each pole' and fifth 'nuclear envelope re-forms around each daughter nucleus'.
Meiosis is a reductional cell division by which a parent cell produces four daughter cells with half of the genetic material.
Meiosis can be divided into meiosis I and meiosis II.
During prophase I (meiosis I),
- Begins the formation of the spindle apparatus from cytoskeleton present in the cytoplasm
- The homo-logous chromosomes pair and crossing over occurs. Crossing over refers to the interchange of genetic material between non-sister chromatids.
During metaphase I,
- The homo-logous chromosomes align at the equator plate of the cell
- The microtubules attach to the kinetochores of sister chromatids
During anaphase I,
- The chiasmata, which link homo-logous chromosomes together until anaphase I, are broken
- The homo-logous chromosomes are pulled to opposite poles, thereby, one chromosome of each pair randomly moves to one pole of the cell and the homologous chromosome to the other.
During telophase I,
- The separated homologous chromosomes cluster at each pole of the new cells
- The nuclear envelope is formed around each cell nucleus.
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Answer: wind, water, and gravity.
Explanation:
A. Cleanliness of food
<span>B. Behavior </span>
<span>C. Sanitation </span>
<span>D. Antibiotics
If the above are the choices given in this question, then my answer is D. ANTIBIOTICS.
Cleanliness of food, behavior, and sanitation are all factors that prevents the spreading of diseases.
Antibiotics are taken to combat the acquired diseases. It simply signifies the presence of a disease that needs to be eradicated from the system.</span>
