Plant parts are flattened and at least some of the original plant material remains. Leaves are often preserved as compressions.
Answer: most similar to the frog the skin cell came from
Explanation:
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B cell activation occurs in the secondary lymphoid organs including the spleen and lymph nodes. After B cells mature in the bone marrow, they migrate through the blood to s<span>econdary lymphoid organs</span><span>, which receive a constant supply of antigen through circulating </span>lymph.
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