Flu vaccines need to be revised and changed every year because the flu virus constantly mutates. Flu viruses can change in two ways: drift or shift. Antigenic drift occurs when genes of the virus slowly change during replication until the immune system no longer recognizes it. On the other hand, antigenic shift occurs when a major change in the virus happens. This usually leads to a totally different kind of virus. This is what happened during the H1N1 scare in 2009.
DNA viruses like mumps are less prone to mutation due to the presence of DNA polymerase. RNA viruses are more prone to mutation because they undergo reverse transcription to simulate the role of DNA.
An animal's physiology can indicate it's diet based on what the animal's body can handle processing. For example, animal's with strong bones and teeth can break down food that is tough to eat, this helps obtain energy alot quicker. For instance, giraffes have long and slender necks that are perfect for reaching up to trees. The giraffe's diet would consist of vegetation located in high levels.
Lecithin is (organic chemistry) the principal phospholipid in animals; it is particularly abundant in egg yolks, and is extracted commercially from soy. It is also a major constituent of cell membranes, and is commonly used as a food additive (as an emulsifier). While cephalin is (biochemistry) a phospholipid found particularly in the cells of nervous tissue; it is also the primary phospholipid in bacteria.
Answer:
It helps to make scientific inquiries
Explanation:
Environmental science is a broad discipline which includes geology, physics, biology etc.
The nature of inquiries is often scientific. The procedures to follow in making useful deductions about environmental phenomenon must be guided scientifically.
Scientific methods is a systematic approach in which scientists can gather facts. Through their numerous observations, they formulate a sort of scientific guess called an hypothesis. Hypothesis can be tested over time and theory springs up. These theories can then be applied to tackle various related scientific puzzles.
