Question

Why does our body need oxygen?

for 5th standard ​

Answer 1

Explanation:

One of the main things it needs is energy. When we eat our body digests the food to get complex molecules like glucose, which it can use for energy. ... The cells also need oxygen to react with the glucose to create the energy. We get the oxygen to our cells with the respiratory system and by breathing.

Answer 2

Our body need oxygen to purify blood