The Octopus

The Octopus

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Intro:

An Octopoda / Octopus mostly live in warm water. It is a spine less cephalopod,
which means it can go through any hole within its beak length and wight .
It has a lifespan of 3-5 years.

Appearance:

An Octopus can grow to about 4.3 and 15.kg. It sustains its form by the water pressure.
its tentacle can have at least 240 suction cups. It can change colours by a thing called
chromatophore, Which is made up of a saccule containing pigment as well as 15-25 muscles,
they use this power to hide or to scare predators. When the muscles are contracted,
the saccule expands making more of the pigment visible. Its beak act like scissors that can
break a crabs shell.

Habitat:

Most octopus species prefer staying in warm because they are cold blooded.  
Octopodes can survive on land for short periods of time, because oxygen is absorbed
through the skin, instead of the gills. An octopus can't live in freshwater because it has
evolved to live in sea water which has a much higher salinity than freshwater.

Diet:

Octopuses eat small crabs and scallops, plus some snails, fish, turtles, crustaceans(shrimp).
They are carnivore which means it eats meat. The octopus’ can taste by it’s suction cups which
helps them navigate through the corals to catch its prey.

Behaviour:

Its hunting style is to wait for his prey, then chase it and corner it in to a coral by making  a dome
out of stretch muscle to contain in it. Its tentacle pass the prey to one another and then feed it to
its beak. He hide from the predators by changing hit appearance and his texture using its little
tiny muscle and its chromatophore. It moves with a mobility called ‘jet propulsion’ which means
sucking water into its muscular sac (water pack) in the mantle cavity (space or hole in your body)
surrounding their bodies and quickly expelling (spit) it out a narrow siphon (move water).

Evolution/adaptation:

Octopus can edit their own gene. They can edit its dna by another gene called rna
(ribonucleic acid). Basically dna is like the blueprint to our body and rna is like the builder that
makes the blueprint real. Rna takes little sections from your genes from the nucleus, and brings
it out to the other cells so it can be translated in to real things. However every creature has rna,
but in most creatures, when their dna gets copied there are unnecessary part in the dna, so the
rna cuts that part with a process called ‘Spliceosome Complex’ in this process helps keep us
stable with all our body part, so this means we evolve slower. However octopuses instead of
slicing their dna they do something called rna editing, which means  they directly edit the
information that the rna carries, which means they evolve faster than us.

Conclusion:

Cephalopod are very interesting especially octopodes because they can almost do everything.

References:

https://www.vanaqua.org/learn/aquafacts/invertebrates/octopuses-and-squids  on 13/4/18

https://www.tonmo.com/threads/why-cant-octopus-live-in-freshwater.2374/ on 13/4/18 by  Nancy

This information is from  google in 13/4/18

This information is from  google in 13/4/18

This information is from https://biology.stackexchange.com/questi
ons/43456/how-long-can-an-octopus-survive-out-of-the-water in 13/4/18

This information is from  google in 13/4/18