Answer:
Scientists figured out that the outer core must be liquid because S waves do not pass through it, but P waves do. The behavior of P and S waves also indicates that the inner core is solid. The speed of seismic waves also depends on the density of the material through which they are traveling.
Explanation:
1) nose 2) mouth
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<span>The fossil Archaeopteryx is a species linking dinosaurs and birds (or modern birds)</span>
Answer:
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The answer is B. It is made up of amino acids.
Explanation:
Collagen:
Collagen is the most abundant protein found in mammals and makes up 25%of the entire protein count. Collagen is mostly present in the form of collagen fibers which give the extracellular matrix structure and support.
Amino acids:
Amino acids are organic molecules that possess the amino (-NH2) functional group. Amino acids are the building block of proteins. They combine together through peptide linkages to form polypeptides and polypeptides link together in the form of complex proteins.
Collagen possesses a complex structure of amino acids arranged in three alpha-chains wound around each other to give a triple-helix.
Under normal conditions air moves from higher pressure system to a lower pressure system
Air moves to lower pressure. This concept can be observed in the lungs and heart. When you trying to inhale, the muscle in ribs or diaphragm will pull the rib cage and decrease its pressure up to -1mm Hg. This will cause the air from atmosphere enter the lungs.
In expiration, the muscle will relax and the air pressure inside lungs will become +1 mm Hg, makes the air pushed out.