What are the options to choose the answer from?
Answer:
The middle ear is an air-filled chamber.
Explanation:
The middle ear is an air-filled cavity/chamber that is between the tympanic membrane and the inner ear.
The air from the atmosphere,photosynthesis,
Answer:
primary succession is the orderly and predictable series of events through which a stable ecosystem forms in a previously uninhabited region.
Explanation:
Asexual reproduction ... it makes a clone of the original plant..