Question

which of the following statements describes why it is essential that our blood carries oxygen throughout our bodies?
without oxygen, our cells would not produce sugar.
without oxygen, our cells would not produce enough energy.
oxygen is converted to co₂ in our cells.
oxygen is required to break down food molecules in the intestines.

Explanation:

Cells need oxygen for aerobic respiration, which efficiently breaks down food to produce sufficient energy (ATP). The other options are incorrect: cells produce sugar via photosynthesis (not human cells), oxygen is the final electron acceptor in respiration (not converted to CO₂ directly), and food breakdown in intestines is digestion (not oxygen-dependent).

Answer:

Without oxygen, our cells would not produce enough energy.