Question

how are tardigrades related to astronomy?
○ they live long enough to survive long space journeys.
○ they are the only life form that requires no oxygen to survive.
○ they can survive in extreme, harsh environments, including space.
○ they are able to propel themselves in zero gravity environments.

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Tardigrades' lifespan isn't the key relation to astronomy; their survival in space - like environments is more relevant.
• Option 2: Tardigrades can survive without oxygen for a while but aren't the only life form with this ability, and this isn't the main relation to astronomy.
• Option 3: Tardigrades are known for their ability to survive in extreme environments, including the vacuum and radiation of space. This directly relates to astronomy as space is an astronomical environment.
• Option 4: Tardigrades don't propel themselves in zero - gravity; they are microscopic and their movement in space isn't a defining relation to astronomy.

Answer:

The correct option is: They can survive in extreme, harsh environments, including space.