The answer is D. Sunlight.
warm front
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The contribution of b-cells is mainly in Humoral immunity. Thus Option A is correct.
<h3>
What is immune system?</h3>
Two types of immunity such as innate immunity is an inbuilt nonspecific immune system protect us from all antigens.
Secondly, we have one more sophisticated adoptive immune system which is up two types humoral immunity and cell mediated immunity.
The adoptive response majorly done by two types of cells such as B and T cells.
This type of immune response use past experience identify a specific foreign threats and counteract them when these threats reappear.
The humoral immune system is activated by external macromolecules antibodies, antimicrobial peptides etc. and protect the extracellular spaces of body.
Hence, Option A is correct.
Learn more about immune system, here:
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Answer: The hospital incident commander
The hospital incident commander is a medical professional, who is usually the leader of the emergency rescue and response plan in disaster conditions. Such a professional has the authority to rapidly expand hospital capacity, recruiting volunteers, and also ensure the availability of medical supplies in situations of medical emergence in during external disaster conditions.
Answer:
pleura
Explanation:
Pleura is a soft tissue that protects the lungs