The short story is this: you can place two species of hydra animals in the same environment at a temperature of 10 degrees Celsius. One will age (Hydra oligactis) and the other one won’t (Hydra vulgaris). Now here are the details. Hydras are primitive multicelullar animals. When well-fed, they reproduce asexually by budding. But when…… Continue reading How temperature switches aging on and off in hydra animals