Hello there ^ _ ^
I believe the answer is : A - Evolution
Good luck!
Answer:
Hello! Your answer would be, D)Fertilization
Explanation:
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The respiratory system consists of all the organs involved in breathing. These include the nose, pharynx, larynx, trachea, bronchi and lungs. ... The nose, pharynx, larynx, trachea and bronchi all work like a system of pipes through which the air is funnelled down into our lungs.
B, immense pressure causes the core to be very compacted and solid.