The answer is b. is under purifying selection
<span>The answer is logistic.In this types of growth, the population growth slows as it reaches carrying capacity. This is when there are increased competition for limited resources, between individuals in the population, in the environment. This slow rate of reproduction also occurs in type I survivorship curves</span>
Regurgitation influences the flow of blood by mixing the oxygen-poor blood with the oxygen-rich blood. Due to this, the heart has to pump more to oxygenate the entire body, leading to the rapid, and fluttering heartbeat. The tissues get oxygenated but regurgitation could be fatal, as the heart cannot function overtime forever.
Valve prolapse influences the flow of blood when the flow of blood backs up. This leads to an irregular or racing heartbeat. Even at certain occasions, the blood can flow back to the lungs. However, there is not a huge influence in the oxygenation of the body tissues.
Stenosis makes the ventricles to pump overtime to get enough blood through, and in the process, the ventricles thicken. This functions for a while, however, it will result in heart failure as the heart cannot do it for entire life. The tissues are oxygenated, but it will be an issue due to overtime.
Individuals with glucose-6-phosphate dehydrogenase deficiency have increased resistance to malaria because the parasite does not survive well in cells with oxidative stress.
<h3>What is the link between G6P deficiency and malaria?</h3>
- Glucose-6-phosphate dehydrogenase (G6PD) deficiency is an X-linked recessive disorder.
- G6PD protects cells from oxidative damage especially the RBCs whose main function is to carry oxygen.
- Mutation in the gene results in G6PD deficiency leading to oxidative stress which can lead to anemia (iron deficiency) as there is breakdown of RBCs.
- However, G6PD deficiency is quite common in parts of Africa, Middle East, and South Asia, which are the regions of high malaria endemism.
- This is due to natural selection in which G6PD deficiency is not eliminated from the population as it can protect people from malaria infection.
- Malaria parasite <em>Plasmodium</em> species does not survive well in cells with oxidative stress.
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These organisms convert nitrogen in the soil to ammonia, which can then be taken up by plants. This process also occurs in aquatic ecosystems, where cyanobacteria participate. After nitrogen has been fixed, other bacteria convert it into nitrate, in a process known as nitrification.
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