I believe the answer is head-on and port (left). The side lights are usually visible to vessels approaching from the front or the side. The red light usually indicates a vessel's port (left) side while the green light indicates a vessel's starboard (right) side. These lights ensure that there is safety at night as the vessels navigate.
I'm not too sure which one of these two but its either A or C
The answer is true because technology we develop today makes powerful medicine in which could help expand life spans. It also helps us cure diseases, injuries, or other life threatening causes.
Option D centrioles helps cells to divide.
