Brushing against some jellyfish can kill you. Why?
962744
the little filaments on their tentacles (also some have little stingers) can be highly toxic.
252040
I saw a movie once in class where millipedes (one sort of them) produce some toxins as a defense mechanism. And then there were these monkeys, that would squeeze the millipede (just enough for them to produce the toxin, not to kill them) and rub them all over their fur. This toxin then protects the monkey from the insects. It also gets them hight, but it wears off in a few hours.
93958
It is disgusting, but from a biological standpoint, as long as you aren't running your hands through the stuff, your chances of getting a serious illness are very low, however if the mice are deermice, I would be concerned about hauntavirus (very deadly), for cleanup, I would recomend bleach/water mix (Bleach is one of the few cleaners that truly kills most bacteria, and viri), plus wear gloves and a dust mask.
682878
ive heard of people with jellyfish genes implanted so that certain organs will glow under a (blacklight)?...
874044
I do not believe that it is the fish itself that is the problem. There is a disease that can be passed if the bacteria get from the fish into a skin cut on a hand or foot or whatever. There are accounts of deaths from rockfish caught and handled without gloves. Check out the bacteria carried on them.
1133680
It's usually not lethal to humans, but it "produces excruciating pain and swelling that lasts for several months. The pain is so excruciating that the victim is rendered almost helpless. The venom can be lethal to dingos, dogs and smaller domestic animals."\n\nNever would have thought a cute oddball like the platypus could be so painful...
668486
What does a jellyfish have to do with hair?????????????
920760
Jellyfish are marine invertebrates belonging to the Scyphozoan class, and in turn the phylum Cnidaria. The body of an adult jellyfish is composed of a bell-shaped, jellylike substance enclosing its internal structure, from which the creature's tentacles suspend. Each tentacle is covered with stinging cells (cnidocytes) that can sting or kill other animals: most jellyfish use them to secure prey or as a defense mechanism. Others, such as Rhizostomae, do not have tentacles at all. To compensate for its lack of basic sensory organs and a brain, the jellyfish exploits its nervous system and rhopalia to perceive stimuli, such as light or odor, and orchestrate expedient responses. In its adult form, it is composed of 94–98% water and can be found in every ocean in the world.\n\nMost jellyfish are passive drifters that feed on small fish and zooplankton that become caught in their tentacles. Jellyfish have an incomplete digestive system, meaning that the same orifice is used for both food intake and waste expulsion. They are made up of a layer of epidermis, gastrodermis, and a thick jellylike layer called mesoglea that separates the epidermis from the gastrodermis.\n\nTheir shape is not hydrodynamic, which makes them slow swimmers. But speed and low water resistance are not important as they are drifters that feed on plankton. It is more important for them that their movements create a current where the water (which contains their food) is being forced within reach of their tentacles. They accomplish this by having a body shaped like a bell which is rhythmically opened and closed.
616561
The scales- Same structure, shape, and composition- In fact, a related function, since sharks will brush the sides of their body by interesting possible food items to scrape off a little (of your skin, for example) in order to "taste" it with special sensors in the skin.  Generally, if a shark does this with a human, they will *not* attack further.
939595
kills fish and other bacteria
964906
It's actually bad for your gums, not your teeth. You're brushing for way too long.
922919
they might give you a long day on the porcelain throne, but unless you eat a couple pounds, unless they are contaimated with a seriously bad type of fungi, i doubt they will kill you.\n\nbut soaking them for a while like earlier suggested was a great idea!
285648
I think the phylum name means "nettle" - it comes from the latin cnida\nthe central cavity is the spongocoel\nAnd i believe that ctenophora have colloblasts on the tenticles which burst when they come into contact with prey, releasing sticky fibres. Some just have mucus covered tenticles. Cnidaria on the other hand are your jellyfishes sometimes with masses of tenticles, and uses stinger cells.\n\nI hope this helps - i will admit marine biology is not my speciality, but I have done a bit.
1023731
Bacteria in the water has killed them off.
780158
Because they have adapted to the pressure...if some humans went down there and reproduced over a number of years, then eventually our bodies would be able to handle it too....and jellyfish..there is almost nothing for the pressure to release it's force on, since jellyfish are extremely subtle matter......
258386
The Dogfish shark is pretty small to be dangerous.  It's not much larger than a small cat... and like most craetures more scared of humans than anything else so no they are not going to attack you or anything.
298760
Because the salt content will dehydrate you. And severe dehydration could kill you especially if you are out at sea and medical treatment is not nearby.