White blood cells are made in the bone marrow. They are stored in your blood and lymph tissues. They help the body fight infection and other diseases.
Answer:
B
Explanation:
competing with stronger organisms makes it difficult for the squirrel to be invasive
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A fish swims with it's fins and breathes under water with it's gills.
C. nucleic acids (consisting of genes which encode for specific proteins to be synthetized)