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.
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Question lacks the appropriate cladogram to represent the shared characteristics with the category however, the correct cladogram is attached with the answer.
Answer:
The correct answer is - chordata.
Explanation:
Based on the characteristics given in the question, human can be placed in the category of chordata as they have multicellular body with tissue organization and also shows bilateral symmetry.
Humans also have body cavity with coelom . Endoskeleton with backbone is the present in the humans as well and known as vertebrates. So these all the characteristic present in the chordata category only.
Thus, the correct answer is - chordata.
It is important because it helps to understand the vital connections between plants and animals