Question

identify the importance of first element, likely oxygen. 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.
complete it

identify the importance of second element, likely carbon. check all that apply.
□ it ensures life on earth can exist.
□ it is the universal solvent.
□ it is a part of all organic compounds, including carbohydrates and nucleic acids.
□ it is found in every living thing.
done

Explanation:

For the importance of carbon (right side):

• "It ensures life on Earth can exist": Carbon is fundamental for organic molecules (like proteins, DNA) that support life, so this applies.
• "It is the universal solvent": Water is the universal solvent, not carbon, so this is incorrect.
• "It is a part of all organic compounds, including carbohydrates and nucleic acids": Organic compounds are based on carbon, and carbohydrates (e.g., glucose, $C_6H_{12}O_6$) and nucleic acids (e.g., DNA with deoxyribose sugar having carbon) contain carbon, so this applies.
• "It is found in every living thing": All living organisms have carbon - based molecules (like proteins, lipids), so carbon is in every living thing, this applies.

• "It ensures life on Earth can exist": Oxygen is essential for aerobic respiration in most organisms, so life depends on it, this is correct.
• "It is a part of all organic compounds": Organic compounds have carbon, hydrogen, oxygen (e.g., glucose $C_6H_{12}O_6$), but not all organic compounds have oxygen (e.g., methane $CH_4$), so this is incorrect (the original check was wrong).
• "It is used by plants for photosynthesis": Plants use carbon dioxide (which has oxygen) in photosynthesis, and release oxygen, but the main reactant for photosynthesis in terms of gas is $CO_2$, but oxygen is involved in the process (as a product and also in plant respiration). However, the main gas taken in for photosynthesis is $CO_2$, but the statement "used by plants for photosynthesis" is a bit ambiguous. But in the context of the checkmark, if we consider that oxygen is involved in plant metabolism (respiration) and also as a product, but the question is about its importance. However, the original check here might be incorrect as plants use $CO_2$ for photosynthesis (to make glucose) and release $O_2$. But if we think about oxygen's role in the ecosystem (plants produce it, and also use it in respiration), maybe the intended idea is that oxygen is important for life (including plants' respiration), so the checkmark here could be correct in the context of the question's options.
• "It is the main component of many biological components, including blood": Blood has water (which has oxygen), and hemoglobin has iron but also is in a protein structure with oxygen - containing groups, and oxygen is transported in blood. So this is correct as oxygen is a main component in the sense of its importance for blood's function (transporting oxygen) and being part of molecules in blood.

Answer:

• It ensures life on Earth can exist (checked)
• It is a part of all organic compounds, including carbohydrates and nucleic acids (checked)
• It is found in every living thing (checked)

For the importance of oxygen (left side, assuming "oxider" is a typo for "oxygen"):