In looking for other planets that might have life, astronomers focus especially on finding planets that _____.

are the same size as Earth
have rocky surfaces
have liquid water
have nitrogen-filled atmospheres

Liquid water and atmosphere are important for life to exist on a planet. Life can exist in the form of unicellular. It must not be multi-cellular organisms like animals. A cell is majorly composed of water. Thus, liquid water is very essential for life to exist. All the life processes require liquid water. Thus, astronomers focus especially on finding planets that have liquid water.

In looking for other planets that might have life, astronomers focus especially on finding planets that _____. are the same size as Earth have rocky surfaces have liquid water have nitrogen-filled atmospheres

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In looking for other planets that might have life, astronomers focus especially on finding planets that _____.

are the same size as Earth
have rocky surfaces
have liquid water
have nitrogen-filled atmospheres