Answer:
B.
During inhalation, the external intercostals contract.
Answer:
Metabolic wastes or excretements are substances left over from metabolic processes (such as cellular respiration) which cannot be used by the organism (they are surplus or toxic), and must therefore be excreted.
This is what i found out i hope this is a good enough answer!! :P
It would help bc building a dam would stop the water from crashing everywhere
