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One of the most difficult things for a human to face is the loss of a limb. If a person loses an arm or a
leg, he/she must be inted with an artificialia
At.
The situation is very different for starfish, If a starfish loses an arm, it can grow a new one.
can even regrow their heads—imagine what the world would be like if humans could do
that. But we can't. Nor can we grow new limbs or even fingers. That's why scientists are studying animals
that can regrow body parts, that is, regenerate. 32.
Many different kinds of animals show some form of regeneration. Most of them are, however, limited
d
to the sorta
en haard is capable of,
regrowing a lost tail A cockroach can grow back a missing limb, but
the limb itself can't generate a new cockroach. Bidirectional regeneration, on the other hand,
refers to a situation in which splitting of an animal will result in separate fully functional animals.
34€ Cut a hydra in half, and you'll get two hydras. Cut it into four pieces
, and you'll get four.
single one can be cut into hundreds of pieces and each will grow back into a whole in a
week or so. Because of this remarkable ability, one planarian can be created over and over, giving it a sort
of immortality. Whether this phenomenon can be achieved in humans will likely require years of research.
(A) Scientists call this unidirectional regeneration.
(B) Humans aren't completely without regenerative talents.
YC) The same thing happens for lobsters, salamanders, and many other animals.
(D) When it comes to regeneration, few animals can equal the magic of the planarian.
(E) This type of regeneration is demonstrated in a few animals, such as hydras and sea stars.
(FQ They hope that this line of research will make regeneration possible in humans someday.
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