They ensure they leave the system and they also ensure that people get the nutrients they need.
Answer:
b
Explanation:
The answer is B becuase "where do people buy tools is not a scientific question, and neither is C.
Answer:
The correct answer is - option D.
Explanation:
In algae or any other photosynthetic organism, there is the internalization of carbon dioxide gas in the reaction with water in the presence of sunlight to produce sugar molecules and oxygen gas in the atmosphere. So, photosynthesis is the process that releases or produces oxygen gas.
In cellular respiration (aerobic) the product of photosynthesis, glucose molecules, and oxygen react to produce the energy and releases carbon dioxide and water as byproducts.
So, the correct answer is - option D.
Because their bodies tell them that they need more oxygen and so breathe faster, and try and get the oxygen their body requires and depends on.