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Which organisms have the ability to regenerate limbs, eyes, and internal structures?
Answer 1:

Salamanders and lizards will often regenerate their tails. Their tails are used to store extra nutrients but if they are threatened or possibly caught by a predator, they will detach their tails in hopes of the tail being a distraction to the predator while the rest of the animal escapes.

Salamanders and young crabs will also regenerate a limb that is lost to a predator or in a fight.

I do not know of any animals that will regenerate eyes or internal structures.


Answer 2:

Generally speaking, the simpler an organism's body, the more regenerative it is. There are some exceptions of animals with very complicated bodies (like some lizards) that can regrow portions of their bodies, but on the whole the simpler your body plan, the better you are at regenerating.

Generally speaking, vertebrate animals and insects cannot regenerate lost appendages. Most others can.


Answer 3:

Yes, there are most definitely organisms that can regenerate - even humans can regenerate to a certain extent. In humans, the distal tip (portion of your finger until your first knuckle), can regenerate until 2 years of age. It can only be done until you are 2 because that's the age our immune system gets stronger and our bodies can fight off disease better then. Also your liver can regenerate after partial transection, blood regenerated cells every 120 days, the lining of intestines turns over every 5 days, muscles are replaced monthly, and our liver is replaced annually. We cannot regenerate from amputations though. Some other organisms in which regeneration is common are sponges, hydra (Cnidaria), protosomes (crustaceans, insets annelids, mollusks), deuterosomes (crabs, sea stars/ cucumbers), chordates, vertebrates (newts, salamander), planaria (flatworms). These are organisms that can recover from amputations. They have stem cells which are "totipotent", meaning can form any type of cell in the body. Totipotent cells are present in early embryonic development in human when the blastocyst starts to form into a cells with major body systems, like the cardiovascular system.



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