Which chemical activates the transformation of trypsinogen to trypsin?

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules