Horseshoe Crabs Saved My Life

What group of animals are horseshoe crabs most closely related to?

• Insects

• Crustaceans

• Arachnids

• Fish

What metal causes horseshoe crab blood to be blue?

• Iron

• Copper

• Zinc

• Magnesium

How do horseshoe crabs protect themselves from bacteria and other invaders?

• They have a strong immune system with white blood cells.

• They produce a protein called coagulogen that forms a gooey barrier.

• They have a thick, impenetrable shell.

• They can change their blood color to scare away germs.

What is a major medical use for horseshoe crab blood?

• To create new vaccines for humans.

• To test injectable drugs and vaccines for bacterial contamination.

• To help human blood clot faster.

• To treat certain types of cancer.