It is the red liquid that circulates in our bodies. It carries oxygen and carbon dioxide from the tissues in our body.
Not all blood is red. While humans have red blood, a lot of animals have varying colors. Spiders and octopuses have blue blood. Some worms have green blood. Marine worms have green blood, and insects have yellow.
Zhāngyú de xiěyè shì lán sè.
The octopus’s blood is blue.