Answer:
Evolution is the process by which populations of organisms change over generations. Genetic variations underlie these changes.
Answer:
It unzips the double helix structure by breaking the hydrogen bonds.
Explanation:
Basically, the enzyme runs down the center of the double helix separating the strands like a zipper so other enzymes needed for DNA replication such as DNA polymerase and topo-isomerase can come and add complimentary bases to the separated strands.
Answer:
The lub sound represents the <u>closing </u> of the atrioventricular valves and the dub sound represents the closure of the valves <u>between the ventricles and arteries.</u> Doctors can also use stethoscopes to monitor respiratory function. A wheezing or whistling sound most likely indicates<u> a constricted trachea.</u>
Explanation:
One can easily feel the heartbeat sound in the form of lub-dub by the stethoscope. The lub sound depicts the closure of the tricuspid valve and the mitral valves. Dub depicts the closure of the aortic and pulmonary valves.
A wheezing sound can be felt in the respiratory tract when an inflammation or blockage occurs in the airways or trachea. The wheezing sound is generally heard at the time of exhaling.
When a person doesn't get enough amino acids there are a lot of symptoms. The most common symptoms are ; trouble losing weight, a slow metabolism, low energy levels, fatigue, poor concentration which can lead to trouble learning, mood swings, muscle and joint pains, and changes in blood sugar levels which could lead to diabetes.
When oxygen is absent, anaerobic respiration occurs ('an' means without).
