Hydrogen fuel cells is the answer
Answer:
C. Increasing its buoyancy
Explanation:
because it doesn't depend upon other unit like kg meter and second
In 2011 NASA researchers identified features on Mars known as Recuring Slope Lineae ( or RSL ). RSL are relatively dark and narrow features.They are thought to be a signs of salty liquid water on Mars. One hypothesis for RSL formation is that they form when underground bodies of salty water leak into the surface.
Answer: Recuring Slope Lineae.
I think iron? i’m not 100% sure
