3 years ago

One hypothesis of viruses states that small viruses started as

1 answer:

8 0

Answer:

Origin of Viruses. ... Small viruses started as runaway pieces of nucleic acid that originally came from living cells such as bacteria. Large viruses were once parasitic cells inside bigger host cells. Over time, genes needed to survive and reproduce outside host cells were lost.

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With the patient's head in a PA position and the CR directed 20 degrees cephalad, which part of the mandible will be best visual

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Rami.

Explanation:

The mandible parts of the individual can be visualized by the different PA positions and at different degrees which are CR directed. The patient's head can be directed into the different degrees.

The rami are well visualized when the patient is in the PA position. The CR directed 20 degrees 20° to 25° cephalad angulation makes the patient rami visible.

Thus, the correct answer is option (B).

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