Answer: Respiration: releasing CO2
Explanation: Photosynthesis is happening at step 2, and decomposition is occurring at step 4 with the soil and animal waste. I just used the process of elimination.
The two strands are antiparallel
It will cause vasodilation of blood vessels in the brain.
CO2 is one of the metabolic end products that can alter the
tone of the blood vessels in the brain. High CO2 levels cause vasodilation,
which may cause headache, whereas low CO2 levels cause vasoconstriction, which
may cause lightheadedness. The statements included in the other options are
incorrect effects.