Question

part b
why is temperature a good criterion for searching for earthlike exoplanets?

Explanation:

Temperature is crucial as it affects the state of water (essential for life as we know it). Earth - like temperatures (not too hot to vaporize water completely, not too cold to freeze it solid) allow for liquid water existence. Also, it influences chemical reactions necessary for life processes.

Answer:

Temperature is a good criterion for searching for Earth - like exoplanets because it determines the state of water (liquid water is vital for life as we know it) and affects chemical reactions that could support life.