- Life Sciences
mass extinction event of 65 million years ago, in which about 85% of all species on Earth died out. This extinction marked the disappearance of the dinosaurs.
bitter yellow or green alkaline fluid secreted by the liver, which serves to emulsify fats
a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva...
the total amount of carbon dioxide produced by individuals, nations or organisations as a result...