Pre-listening vocabulary
- immortality: the ability to live forever
- phenomenon: a natural process, especially a strange or unusual one
- species: a type of plant or animal
- reproduce: to create new cells
- DNA: chemicals that contain instructions for life
- reverse: to make something go backwards
- extend: to make something longer
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Gapfill exercise
Biological immortality is a very rare phenomenon. Most species go through a called senescence, which means the cells in their bodies stop reproducing over time. As these species get older, and death become much more likely. However, a few rare species do not experience senescence at all. Lobsters are one animal that does not age typically. They can their own DNA using a chemical called telomerase. Tortoises also appear to delay senescence. A species called the “immortal jellyfish” is the only animal believed to be truly biologically immortal. These jellyfish can still , but not of old age. This is because they have the ability to reverse their aging process entirely. Scientists study these slow-aging species in case their cells can help extend human .
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