Answer:
D.
Explanation:
The respiratory system is responsible for breathing—that includes oxygen.
Gravity
Hope this helps xox :)
Internal Conflict: the psychological struggle within the mind of a literary or dramatic character, the resolution of which creates the plot's <span>suspense.
External Conflict: the </span>struggle between a literary or dramatic character and an outside forcesuch as nature or another character, which drives the dramatic actionof the <span>plot</span>
