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The butterflies migrate across continents following weather patterns. This movement strategy allows them survive different seasons and find food sources. When butterflies migrate is important process that helps species continuation and population growth.
描述
The immune system relies on primary and secondary lymphoid organs. Primary organs, the bone marrow and thymus, produce and mature lymphocytes (B cells in the bone marrow, T cells in the thymus). Secondary organs, including lymph nodes and the spleen, are where mature lymphocytes encounter and respond to pathogens, initiating an immune response. Lymph nodes filter lymph, trapping pathogens, while the spleen filters blood and removes old red blood cells, contributing to the body's defense. These organs work collaboratively to maintain immune health.
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