๐. ๐๐ง๐ง๐๐ญ๐ ๐๐ง๐ ๐๐๐๐ฉ๐ญ๐ข๐ฏ๐ ๐๐ฆ๐ฆ๐ฎ๐ง๐ข๐ญ๐ฒ: The immune system consists of both innate immunity (nonspecific, immediate defense mechanisms) and adaptive immunity (specific, targeted responses acquired over time). Immunologists study the interactions between these two types of immunity. ๐. ๐๐ง๐ญ๐ข๐ ๐๐ง๐ฌ ๐๐ง๐ ๐๐ง๐ญ๐ข๐๐จ๐๐ข๐๐ฌ: Immunologists investigate antigens (foreign substances that trigger immune responses) and antibodies (proteins produced by the immune system in response to antigens). The interactions between antigens and antibodies are fundamental to immune defense.
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