Question

identify the importance of water. check all that apply. it ensures life on earth can exist. it is a part of all organic compounds. it is used by plants for photosynthesis. it is the main component of many biological components, including blood. done

Explanation:

• "It ensures life on Earth can exist": Water is essential for the survival of all known forms of life, so this is correct.
• "It is a part of all organic compounds": Organic compounds are primarily composed of carbon and hydrogen, and water ($H_2O$) is not an organic compound and not a part of all organic compounds, so this is incorrect.
• "It is used by plants for photosynthesis": In photosynthesis, plants use water along with carbon dioxide to produce glucose and oxygen, so this is correct.
• "It is the main component of many biological components, including blood": Blood is mostly water, and many biological tissues and fluids have a high water content, so this is correct.

Answer:

• It ensures life on Earth can exist.
• It is used by plants for photosynthesis.
• It is the main component of many biological components, including blood.