It was believed that a asteroid hit the Earth (specifically Mexico) when the asteroid hit it caused a freezing darkness due to dust and debris being kicked up by the asteroid . The dust and debris blocked the sunlight causing a temperature drop.
Why dont you try asking google or a teacher to help you out?! :D
Food is digested, or broken down, so that the nutrients can be extracted for use by the body as it passes through the digestive system. If food wasn't digested you would not have energy required to run vital chemical reactions and eventually resulting death
Provide organs and muscles with the oxygen they need to function

Correct choice is " Eating Carbohydrates "
Animals and other organisms access Glucose for cellular respiration, by eating <u>Carbohydrates</u> .