Word: flatworm
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Dates: during 1938-1938
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...lowly, cross-eyed little flatworms called planarias are highly regarded by zoologists, for they are the "lowest" animals in evolutionary rank which possess a definite head, right and left side, top and bottom, front and rear. Though it has no backbone, the flatworm is tenacious of life. If it is decapitated, the head will grow a new body, the body a new head. If the head is divided by a longitudinal cut toward the tail, each part will become a complete new head, making a two-headed monster. If part of a flatworm's head is removed and grafted...