What are octopuses made of that they can blend in

By using their chromatophores and changing the texture of their skin octopuses can seamlessly blend into rocks, corals and sponges. They can also use color to warm predators, like the highly-venomous blue ringed octopus who flashes its blue rings to tell other animals to stay away

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.