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oksano4ka [1.4K]
3 years ago
14

2. A structural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of:

Biology
1 answer:
Ierofanga [76]3 years ago
8 0

Answer: rings made from cartilage.

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The experimenter changes the independent variable and that has the influence on dependent variable. So, the effect on the dependent variable is tested (observed and recorded).


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