Outdoor CO2 levels are frequently as low as 400 ppm, whereas interior CO2 levels typically vary from 420 to 1000 ppm. CO2 values under 1000 ppm are considered healthy levels. The best way is to open all the windows of classroom.
What are the health risk of high CO₂ level?
- People may have moderate symptoms like sleepiness, restlessness, an accelerated heart rate, and breathing difficulties if levels exceed 1000 ppm.
- This is particularly problematic in educational settings when learning new material calls for increased focus and attention from students.
- In addition to causing significant discomfort, levels of CO2 above 2000 ppm prevent pupils from functioning at their best in class and, over time, impair the growth of their cognitive abilities.
- In addition to the above described symptoms, there are others including nausea, poor focus, and feeling stifled.
- Indoor CO2 levels are normally below 1000 ppm, but if there are more than 20 pupils and teachers in a closed space, the CO2 levels will naturally rise, and it is not unusual for them to exceed 3000 ppm.
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I believe it’s D. Carbohydrate
Its telling you to use a punnet square
Causes of speciation
<span>Geographic isolation
In the fruit fly example, some fruit fly larvae were washed up on an island, and speciation started because populations were prevented from interbreeding by geographic isolation. Scientists think that geographic isolation is a common way for the process of speciation to begin: rivers change course, mountains rise, continents drift, organisms migrate, and what was once a continuous population is divided into two or more smaller populations.
</span>Reduction of gene flow
<span>However, speciation might also happen in a population with no specific extrinsic barrier to gene flow. Imagine a situation in which a population extends over a broad geographic range, and mating throughout the population is not random. Individuals in the far west would have zero chance of mating with individuals in the far eastern end of the range. So we have reduced gene flow, but not total isolation. This may or may not be sufficient to cause speciation. Speciation would probably also require different selective pressures at opposite ends of the range, which would alter gene frequencies in groups at different ends of the range so much that they would not be able to mate if they were reunited.</span>