Question

1. how can we search for evidence that other planets were once habitable?

Explanation:

We can search for evidence through space - based and ground - based telescopes to look for signs like the presence of water (in the form of ice or vapor), atmospheric composition indicating past or present chemical reactions related to life, and geological features that suggest a past environment suitable for life. We can also analyze meteorites that may have originated from other planets for clues about their past habitability.

Answer:

We can use telescopes (space - based and ground - based) to look for signs of water, analyze atmospheric composition, study geological features, and examine meteorites.