Give two reasons how are seals designed for swimming in cold sea?

Answer 1

1) Blubber helps insulate seals in polar conditions. True seals rely on blubber more than fur seals do because true seals live a more aquatic life. Fur seals depend more on their special under-fur that is waterproof and helps regulate their body temperature.

Ever see a completely hairless seal? Probably not, since even a little fur helps keep protect them from the cold and wet. All seals molt to replace their old fur with new fur, though they don't lose all their fur at once.

2) In response to the cold Antarctic temperatures, a seal's blood vessels constrict and cut off the warm blood sent to skin that touches the ice surface. That means a seal's skin gets very cold (close to freezing). This fridge-friendly feature means that the seal's blubber can insulate the animal's internal organs without fighting to keep the exposed skin warm. All the energy is used to protect the seal's critical parts and pieces, like its heart and brain. A seal's core body temperature is around 38 degrees C (100 degrees F).

Seals also use Antarctica's solar energy to heat up… which can be a bad thing on warm days! They can quickly overheat when moving from the cold ocean to Antarctica's solar panel of ice and snow.

Hope this was useful ;)