We wish you a very Happy Halloween with this science-related quiz.
All Hallow's EveSee answer
IrelandSee answer
Central AmericaSee answer
On vinesSee answer
90 % waterSee answer
Carotenoid pigments such as β-caroteneSee answer
Theobromine, named after Theobroma, the genus of the cacao tree (Greek for "food of the gods").See answer
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 bloodstreamSee answer
20 secondsSee answer
Yes. They use different oxygen-carrying proteins.See answer
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
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