Why do cells need oxygen to survive?It allows them to produce haemoglobinIt is an ingredient for photosynthesis, which is needed to produce sugarsIt helps them release energy from sugarsIt makes them flexibleI'm not sure

Cells need oxygen to survive because it helps them release energy from sugars. Here’s a step-by-step explanation:

1. Cellular Respiration: Cells use a process called cellular respiration to convert the energy stored in sugars into a form that can be used by the cell, known as ATP (adenosine triphosphate).

2. Role of Oxygen: Oxygen is a crucial component of cellular respiration, specifically in the stage known as the electron transport chain, which takes place in the mitochondria.

3. Energy Release: During the electron transport chain, oxygen acts as the final electron acceptor. It combines with electrons and protons to form water, a process that releases a significant amount of energy.

4. ATP Production: The energy released during this process is used to produce ATP, which cells use to perform various functions necessary for survival.

Therefore, the correct answer is: It helps them release energy from sugars.