Question

1. our cells need __________ to perform cellular respiration. *

carbon dioxide
oxygen
gases

1. without oxygen we cant produce __________ and we will not last very long. *

gases
glocouse
energy

Explanation:

1. Cellular respiration is an oxygen - dependent process. Oxygen is used to break down glucose to release energy. Carbon dioxide is a product of cellular respiration, not a requirement for the process to start. Gases is too general.
2. Oxygen is crucial for aerobic cellular respiration which is the main way cells produce energy (ATP). Glucose is the starting molecule for cellular respiration, not a product that depends on oxygen for production in the context of this question. Gases is not specific.

Answer:

1. B. Oxygen
2. C. Energy