Question

if liquid water did form the channel of mars, what does that mean about mars?

Explanation:

The presence of channels formed by liquid water on Mars indicates that Mars may have had conditions suitable for liquid - water existence in the past, such as a warmer climate and a thicker atmosphere to prevent water from freezing or evaporating too quickly. It also implies a possible past hydrological cycle and raises the possibility of past life as water is essential for life as we know it.

Answer:

It implies Mars may have had past conditions favorable for liquid - water existence, a possible hydrological cycle, and raises the possibility of past life.