Yes. Octopus will eat fish, though they eat other things as well, with crabs high o the list.
Because it blends in the surroundings.
seaweed doesn't eat it is a photosnythesizer.
They eat seaweed and algae!
Fish eat seaweed. Dolphins eat fish. No seaweed, no fish, no dolphins.
Whales eat octopus [sperm whales have giant octopus as a favorite food]. Octopus eat each other octopus. Humans eat octopus. Anything that can catch an octopus (that isn't easy) will eat it. Killer whales [or Orcas, a kind of toothed whale] eat octopuses.
A shark or other big fish eat a octopus.
seaweed for 1st level (producer),a small fish that would eat the seaweed for 2nd,and last but not least a large fish or sea creature like an octopus or shark that eats the small fish.
Certain small bacteria will in fact eat seaweed. These small bacteria will typically only eat seaweed that is dying or dead.
People eat seaweed
Yes
Ducks eat fish and seaweed among other things
It will only turn green if the seaweed it is sitting on is green. It turns colour to blend into the background so that it can not be seen by it predators or its prey.