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node-based group including the ancestor and all descendants of at least two living species. = Living node-based group.

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What is total group?

branch-based group including the crown group plus the stem group.


Are protists monophyletic polyphyletic or paraphyletic?

Protists are a paraphyletic group because animals, fungi, and plants are the crown groups evolved from different lineages of the protists. They aren't included in the same group as protists taxonomically. This explains why the cladists consider the protist a paraphyletic group.


What instrument is used to crimp a stainless steel crown prior to seating it?

A stainless steel crown is typically crimped using a crimping instrument known as a crown crimper or crown contouring pliers. This tool allows the dentist to adjust the margins of the crown for a better fit and to ensure that it secures tightly onto the tooth before it is seated. By creating a more accurate adaptation to the tooth, the crimper helps improve retention and reduce the risk of crown dislodgment.


What was the sapphire on the queens crown called?

The sapphire on the queen's crown is known as the Stuart Sapphire. It is a large blue sapphire that was originally part of the coronation ring of the Stuart Kings of England. Today, it is set in the British Imperial State Crown and is one of the most prominent gemstones in the crown jewels.


If Archimedes had only been able to find a piece of pure gold with a mass one-half that of the crown how could he have determined whether the crown was pure gold?

Archimedes came across concept of density - that is MASS divided by VOLUME. For each substance this ratio is different but a CONSTANT for that substance. Thus the mass you are dealing with is irrelevant if the crown had the same ratio as the piece of pure gold then the crown was pure god, if it did not then the crown was not gold.