Gradual process of a species becoming extinct

What is the gradual process of species becoming extinct called? What is the event in which a large percentage of all living species become extinct in a relatively short period of time?

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.