Answer: <span>hyaline cartilage rings
Hyaline cartilage rings in a shape of a C prevent the tracheal wall from
collapsing inward and obstructing airway (during inhalation). Posteriorly (</span><span><span>open portion of each ring) </span>there is not cartilage but there is muscle so that the esophagus can stretch (the </span>esophagus is behind the trachea).
This question is incomplete; here is the complete question:
_____ is work done to keep equipment in good working order.
A. Defragmentation
B. Preventive maintenance
C. Virus protection
D. A maintenance schedule
The correct answer is B. Preventive maintenance
Explanation:
Maintenance refers to the processes done on machinery or equipment to preserve its proper functioning. Moreover, this maintenance is preventive if it is done to prevent equipment from breaking down or having any malfunctioning. Besides this, preventive maintenance is globally recommended because in this way equipment used at home or in business works properly. According to this, the correct answer is preventive maintenance.
Answer:
Mutation is any change in DNA sequence of an organism. Mutantion can occur in any living organism including plants, animals, fungi, bacteria and protists.
Explanation:
