A giant pacific octopus have a huge head with 8 legs attch to it, it have pigment cells, tentacles all over it's body, it have 3 hearts; 2 brancial hearts and 1 systemic heart.
there are 289 species of octopus
octopus have 200000 species spiecies
There are around 300 recognized octopus species.
I think it depends on the type of octopus. I think the most common type of octopus is called the Common Octopus (octopus vulgaris). Hence the name! One of the most venemous types of octopus is the Blue Ringed octopus. If you are looking for a better answer search for 'types of octopuses' and maybe it will tell you which ones are more common.
The whole species of octopus is not entirely endangered, but there are some subspecies that are endangered, threatened, or close to being endangered: The Giant Octopus, a giant but gentle octopus, is listed as "Endangered" on the ICUN Redlist.
The weight of an octopus can vary significantly depending on the species. Most common species, like the common octopus (Octopus vulgaris), typically weigh between 10 to 30 pounds (4.5 to 13.6 kg). However, some larger species, such as the giant Pacific octopus, can weigh over 100 pounds (45 kg) or more. Overall, octopus weights can range from just a few pounds to over 150 pounds, depending on the species.
Octopus bimaculoides
Some are but the regular octopus that we buy at the store are not. I hope that helps.:)
It appears to vary from species to species. For example, Octopus aegina has it; but Octopus vulgaris does not.
Octopus is commonly known as the devil fish. There is no species of that name "Devilfish Octopus". But octopuses have a large variety in sizes as well in species. here is a website with a list of species and their sizes.
Almost certainly not. Most octopus species are doing well although some may be in some trouble. Check IUCN Redlist.
Blue ringed octopus is the common name for the genus Hapalochlaena, which contains three species:*Greater Blue-ringed octopus (Hapalochlaena lunulata)*Southern Blue-ringed octopus, also known as the Lesser Blue-ringed octopus (Hapalochlaena maculosa)*Blue-lined octopus (Hapalachlaena fasciata)Based on one description given of a single specimen in 1938, some think that there may be a fourth species, Hapolachlaena nierstraszi, but that is uncertain.