<span>When someone is performing a very routine phlebotomy, which is the act of inserting a needle in a vein to draw blood, the most commonly used needle are needles with gauges of 20 or 21.</span>
5 air masses that affect the united states are continental polar(cP), continental arctic(cA), continental tropical(cT),maritime polar(mP) and maritime tropical(mT).
The source of origin of cP is the snowy regions of Canada and Alaska ,of cA is the Arctic basin, of cT is Mexico and south west US, of mP is the Northern Pacific Ocean and mT is the Gulf of Mexico,the Carribean sea,western Atlantic and subtropical Pacific.
<u>Explanation:</u>
Air masses are volumes of air that has uniform characteristics. Air masses are divided into two based on its moisture content. They are continental air mass and maritime air mass which are dry and moist respectively.
The first letter in the abbreviation of an air mass denoted whether the air mass is continental or maritime. The letter c represents continental air mass and letter m represents maritime air mass. The source of origin of the air mass is represented by the second letter in the abbreviation of the air mass.
Air mass with tropics as the source of origin is represented by the letter T, air mass with equator as the source is represented by letter E, air mass with pole as the source is represented by the letter P and air mass with the Arctic or Antarctic as the source is represented by the letter A.
Some fossil snakes have remnants of hip bones and legs even though these animals had no legs. These remnant structures are best described as:<u> vestigial structures</u>.
Vestigial structures are organic structures that do not appear to fulfill any important biological function in the organism that possesses them.
- These structures are preserved as an inheritance of the evolutionary process, because at some point in the history of evolution an ancestor of the current species had that structure.
- These types of structures, which can be bones, organs, structures in the skin or any other part of the body, no longer offer any meaningful function for the body.
- The presence of vestigial structures in animals is considered proof that evolution and natural selection exists.
Therefore, we can conclude that some fossil snakes have remnants of hip bones and legs even though these animals had no legs. These remnant structures are best described as vestigial structures.
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An eye consisting of an array of numerous small visual units, as found in insects and crustaceans.
