When the sea urchin genome was sequenced, researchers concluded that this invertebrate has an exceptionally strong immune system.Which is the most likely observation that led researchers to this conclusion?
A) Sea urchins make more antibodies than humans do.
B) Sea urchins have many more toll-like receptors than humans.
C) Sea urchins do not have clonal deletion of B cells, so they can respond to more different types of pathogens.
D) Sea urchins make a compound with antimicrobial properties that lyses bacteria.
E) Sea urchins have more types of MHC proteins than humans.
Correct Answer:
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