Question

What might scientists most likely look for on other planets with regards to living organisms?

Answer 1

probably first they look for presence of water

Answer 2

Heena is quite right about the water. Other things might be carbon - as oxides and methane, nitrogen, oxygen and phosphorus. That's if the life on other planets is carbon - based.

Answer 3

Along with water, they might look for oxygen, suitable temperature range, and other necessary substances which r potent or support life on the planet.