The trachea has an epidermis layer that acts as a barrier and protects organs from things such as : dust, mucus and also pathogens Hope that helps :)
The answer is <span>Carbon CO2, this supplies the carbon component of carbohydrates. </span>
Answer:
A - matter changes but no other substance is formed.
Explanation:
A physical change is a type of change in which the form of matter is altered but one substance is not transformed into another. Therefore a change of matter is a physical change.