Answer:
Carbon dioxide turns into glucose and water turns into oxygen
Answer: The virus weakens as time passes.
Explanation: The virus will weaken continuously during transmission, and will reduce its toxicity after several generations of transmission, without causing much harm to the human body.
<span>The red algae contain an accessory pigment called "Phycobilin"
Hope this helps!</span>
Animals use the respiratory system to breathe in oxygen and other gases and expel gases like CO2, right? O2 in, CO2 out.