Carbon dioxide is considered a pollutant when larger concentrations than normal are present in the air as a result of human activity. Option B.
<h3>What are pollutants?</h3>
Pollutants are solid, liquid, or gaseous substances that when present at a certain concentration threshold, affect living organisms in the environment negatively.
In other words, a substance cannot be labeled a pollutant until it reaches a concentration level that is harmful to living organisms.
Thus, carbon dioxide is a natural component of air at a normal concentration. Once the concentration level increases and it starts affecting the environment negatively, it becomes a pollutant.
More on pollutants can be found here: brainly.com/question/23857736
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Option A is the correct answer
Reason:
Due to the low temperature and very high rainfall, the Crop could not grow properly in European nation. Due to this , the people devoid of food reached at the verge of dying. After certain point of time there was feminine. The effect were so devastating that these lasted even after the winter season was over. Lack of food raised the price of food item
B Nucleus
Only Eukaryotes have a nucleus. Prokaryotes have the DNA floating around in cytoplasm.
Answer: average popular size in a particular habitat. The species population size is limited by environmental factors like adequate food,shelter,water,and mates
Explanation: