Pharyngeal constrictor muscles (superior, middle and inferior)
The pharyngeal constrictor muscles are a group of muscles that form the lumen of the pharynx. After you swallow, an act that you have control, it starts a involuntary contraction by these muscles to propel the bolus downwards.
The answer is A) less than 2.9
In evolutionary biology, phylogenetic trees are used to exhibit and illustrate the evolutionary relationships of two or more organisms, and identify the origins of life altogether. To achieve this, there are three methods of classification which are phonetics, cladistics, and taxonomic groups.
Bacteria are benifical for humans in many ways
1) Bacteria like lactobacillus helpful in the preparation of curd
2)They are also are used in agriculture to increase soil fertility
3)They are helpful in industries to produce alcohol,wine and acetic acid
4)They are aslo used in cleaning the environment
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