Answer:
The answer is number two extinction happened, this was the time dinosaurs went extinct ebcause lack of sun because oh how much dirt was blown into the earth atmosphere becuase of the asteriod, third option is talking about big bang theroy so that dosnt apply!
Explanation:
Slow Movement muscles of Stomach:-
These are helpful in a process called churning. This kind of mixes the gastric juice with the food and the movement also plays a role in converting the bolus into Chyme.
Short length and slow.movement of muscles of intestines also help in the same way as they mix the secretions in the intestines (such as bile and pancreatic juice) with the food.
The mask should be 'fit checked' to avoid openings around the seams of the mask and be adjusted to the shape of the face. Any opening can be a way for any microorganism, especially airborne microorganisms, to pass through the mask and infect the person.