The development of the unborn child's nervous system begins at about <u>5 weeks.</u>
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- A developing fetus's central nervous system begins as a straightforward structure termed the "neural groove," which folds into the "neural tube."
- The brain and spinal cord then develop from this. The brain tube should be closed and fused by day 28 following conception.
- Within her embryonic body, the neural plate, an oval-shaped disc of tissue, begins to form.
- Although the intricate elements of the brain continue to grow and develop through the end of pregnancy, development ends around the age of 25, the brain and nervous system of the embryo start to develop at just 5 weeks.
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Over harvesting can affect an entire species, because it can change relationships in the food web, for example with too many whales many organisms could lose their food source and homes, or even worse, could go extinct!
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Based on the broth left on an open flask experiment, wherein the boiled broth was placed in two flasks (one flask with straight neck and the other flask has a bent neck) and exposed to open air at room temperature for several weeks.
The broth within the straight neck flask has changed its appearance. It became discolored and cloudy. Whereas, the broth in the bent neck open flask still remains the same.
These results would then support the conclusion that germs in the air were able to fall unobstructed towards the straight neck flask and contaminate its contents. While, the bent neck of the 2nd open flask acted as a trap for the germs, preventing the germs from contaminating the broth. Further emphasizing that germs can only come from other germs and not from spontaneous generation.
Isopropyl alcohol causes the DNA to precipitate. When DNA is emerged in the solution, when it comes out it will ideally clump together, making it visible. Isopropyl alcohol is a key ingredient when isolating DNA. Ethanol also can be used to achieve this.
