Answer:
Explanation:
Meiosis is a form of cell division that occurs in the sex cells of organisms. It ensures the reduction of a diploid cell to an haploid cell to allow for the formation of a diploid zygote after fertilization (contribution of both parents haploid sex cells to give a diploid zygote). Thus, this process is very essential and important.
The reduction is accomplished by 2 divisions after the duplication of chromosomes
- first division: separation of homologous pairs of chromosomes (this reduces the total in half)
- second division: separation of sister chromatids of a chromosome.
The rearrangement in meiosis occurs by crossing over/genetic recombination.
This is the exchange of genetic material between homologous pairs of chromosome bringing about a rearrangement and genetic variation
An example of a chromosomal abnormality that arises as a result of defects in this process is the Down Syndrome which is caused by a nondisjunction of the chromosomes 21 pair in a sex cell.
This condition produces offsprings that have some characteristic facial features, short stature etc
Answer: Hope I help!!!!!b:D
Explanation: Well, things eat the algae, and if algae is taken from an ecosystem, then it could unravel. Another thing, depending on the species, algae helps break things down like waste and clean the water!
The use of synthetic fertilizer instead of organic fertilizer has the advantage of producing more crops in a shorter period of time. The organic fertilizer is slow.
<h3>What is fertilizer?</h3>
Fertilizers are used for crops to feed the large and growing population of the world. It allows for more output in less time. As a result, the soil becomes sterile if it is spread with fertiliser for a long period of time. The soil can't hold the nutrients and minerals because of it. While organic fertilizer takes more time to produce but is good for soil health, the earthworm and other animals can live if the chemical fertilizers are less used and make the soil more fertile.
Hence, the only advantage of using synthetic chemical fertilizer is that it can increase production in less time for some years, but after that, the soil will become sterile.
Learn more about the fertilizer, here
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This would be a D) "physical model."
It's not natural, because it's not out in nature.
It's not conceptual because that would just be ideas, arbitrary compared to physical ones.
And it's not mathematical, because that would only involve equations, graphs, and tables.
"Asthma is a lung disease that inflames and narrows the airways, causing wheezing, chest tightness, shortness of breath, and coughing at night or early morning" - nlm.nih.gov
