What is Christopher Columbus known for? Christopher Columbus was a navigator who explored the Americas under the flag of Spain. Some people think of him as the “discoverer” of America, but this is not strictly true. His voyages across the Atlantic paved the way for European colonization and exploitation of the Americas. What did Columbus […]
Are Tunas warm-blooded?
Are Tunas warm-blooded? Almost all fish are cold-blooded (ectothermic). However, tuna and mackerel sharks are warm-blooded: they can regulate their body temperature. Warm-blooded fish possess organs near their muscles called retia mirabilia that consist of a series of minute parallel veins and arteries that supply and drain the muscles. What sharks are cold blooded? Though […]