Are white blood cells that continually patrol the body in search of foreign molecules. a) platelets b) antigens c) macrophages d) none of the above

Macrophages is the answer (C). There is not much to be added to this answer since the question itself describes macrophages perfectly.

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igneous rock formed from below the surface would have more crystals because

answer: because magma cools more slowly than lava

d. the weight of the book