The answer is B and D i learned this in biology last week
1. Denatured
2. Catalyst
3. Specific
4. Cofactor
5. Complex
6. Active Site
7. Substrate
The reason is they are afraid of being picked on by a bigger crowd therefore increasing their chances to be bullied
The answer is Pharyngeal Phase and Esophageal Phase stages of swallowing. In the pharyngeal phase, the bolus of food is pushed against the epiglottis, which closes the respiratory tract. The upper oesophageal sphincter relaxes and the bolus moves into the esophagus. In the oesophageal phase, the oesophageal sphincter closes when the bolus moves down and peristalsis action takes over to move the food down the oesophagus.
If they were to lose this selectivity, the cell would no longer be able to sustain itself, and it would be destroyed.
