16. Scientists have been examining increased levels of carbon dioxide in the atmosphere and its effect on the growth of marine viruses, the growth of their bacterial hosts, the ocean's temperatures, and the circulation of ocean waters. Which factor being studied by the scientists is biotic?
Answer: B
Bacteria
Bacteria represent a biotic factor being studied by scientists in relation to the effects of increased carbon dioxide levels in the atmosphere. As living organisms, bacteria play a crucial role in the marine ecosystem, particularly as hosts for viruses.
A) Ocean temperature
Ocean temperature is an abiotic factor, as it pertains to the physical environment rather than living organisms. While it influences the growth of marine life, including bacteria, it is not a biotic component of the ecosystem itself.
B) Bacteria
Bacteria are indeed a biotic factor because they are living organisms that interact with viruses and are influenced by environmental changes, including those caused by increased carbon dioxide levels. Their growth and health can significantly affect marine ecosystems.
C) Ocean circulation
Ocean circulation is an abiotic factor that refers to the movement of water in the oceans. It affects temperature and nutrient distribution but does not consist of living entities, making it distinct from biotic factors.
D) Carbon dioxide
Carbon dioxide is an abiotic factor as it is a chemical compound that affects the atmosphere and, consequently, marine ecosystems. However, it does not represent a living component, which is necessary for something to be classified as biotic.
Conclusion
Bacteria are the only biotic factor among the options provided, as they are living organisms integral to marine ecosystems. In contrast, ocean temperature, ocean circulation, and carbon dioxide are abiotic factors, focusing on environmental conditions rather than living components. Thus, the identification of bacteria as the correct answer highlights the importance of biotic interactions in the study of marine environments.