The Brain is the only system that doesn't replace cells when lost
<span>The answer is Viking 1 and 2 that explored Mars
planet. Both were launched in 1975 and their mission ended in 1980. The main
objectives of the orbiters and landers were to take pictures of the planet,
collect samples, and conduct experiments to find signs of life on the planet. </span>
This would be the water cycle
Answer:
That's what I had so far. 2) a. Lungs b. Closed
3) CO2 / Oxygen
