Explain why scientists believe that most animals would become extinct if all plants dies

A lot of animals eat only plants, if all the plants die, they would have no food for them to continue life. Also, the animals that don't eat plants wouldn't be able to eat them if they were dead and rotted. Or, they would eventually kill off the rest of the animals that aren't dead yet and would go extinct that way. Once they are all extinct, there would be no more left for the other animals to eat, meaning they would go extinct as well.

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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.