jellyfish have no blood and exist at the temperature of their surroundings, as do cold blooded organisms
jellyfish and reptiles are cold blooded animals.
no
Yes, but not too cold. You can wear a light sweater with shorts and be fine.
yes
When there are too many at one place at a certain time, then yes, of course. Jellyfish "sting" people and too many jellyfish near the shore of a beach is bad news. This is why some beaches close at certain seasons (there are too many jellyfish)
on the coast of california
Because box jellyfish, as with all other cnidarians, do not have blood, or a circulatory system, they can not be considered "cold-blooded." However, they are ectotherms whose body temperatures are equal to the temperature of the environment.
Jellyfish can be found in many parts of the world as the can live in seawater and freshwater. Jellyfish are in the waters of Hawaii, California, France, Africa and Australia.
you can just leave them in cold water but not super cold.
Nothing. If the wound is not too serious the jellyfish will heal by itself
If you are planning a trip for your grandmother for the summer I would suggest going to California. California generally has a very temperate climate. Not too hot and not too cold.