TRUTH SLEUTH
Blue
Dive into ocean science.
News
Jr.
👤
?
Today's Dive
Question 1 of 5
🐙
Observed or Inferred?
Octopus
· tap the icon for a fact
An octopus has blue blood. Scientists say that is because its blood carries oxygen using copper instead of iron. Which part did they see directly?
A
The blood looks blue.
B
The blood carries oxygen with copper.
C
Copper carries oxygen better than iron in cold water.
D
The octopus lives in cold, deep water.
Check my answer
🐞
Report an issue