Halloween Quiz

All Hallow's Eve

Ireland

Central America

On vines

90 % water

Carotenoid pigments such as β-carotene

Theobromine, named after Theobroma, the genus of the cacao tree (Greek for "food of the gods").
Theobromine was formerly known as xantheose. It is a bitter alkaloid of the cacao plant and is also found in some other foods, including the leaves of the tea plant, and the kola nut. Caffeine differs from theobromine in that it has an extra methyl group.

Because of the protein hemoglobin. It contains the red compound heme that is crucial for carrying oxygen through your bloodstream

20 seconds

Yes. They use different oxygen-carrying proteins.

Green blood is found in some species of worms and leeches. They use chlorocruorin to transport oxygen


Blue blood is found in crustaceans, spiders, squid, octopuses, and some molluscs. They use hemocyanin to transport oxygen

Violet blood is found in a few marine worms (peanut worms, penis worms, brachiopods). They use hemerythrin to transport oxygen