[Answer] What do octopuses, lobsters, and horseshoe crabs have in common?

Step 1 : Introduction to the question "What do octopuses, lobsters, and horseshoe crabs have in common?"

...Animals and insects are different in myriad ways from humans. For example, not all animals and insects have red blood (all humans have red blood, though.) Animals may have blood that's red, green, blue, purple, yellow, and even white. The colors are the result of different proteins and pigments in the blood. For instance, animals such as some octopuses, lobsters, and horseshoe crabs have blue blood. The color results from copper proteins called hemocyanin. This is one of the biggest known proteins, and they have 24 subunits that work together to form the blue pigment in the blood. Source: AnimalHow.com

Step 2 : Answer to the question "What do octopuses, lobsters, and horseshoe crabs have in common?"

Have blue blood:

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