#ocean
Sharks are older than trees
animalsSharks have existed for over 450 million years, predating the first trees which appeared around 350 million years ago. Sharks survived all five of Earth's…
Octopuses have three hearts and blue blood
animalsAn octopus has three hearts: two branchial hearts pump blood through the gills, while a third systemic heart circulates it through the body. Their blood is…