The experimental rate law of a simple reaction A → B + C is v = k[A]. (a) Determine total order of the reaction. (b) Imagine initial conditions at which the rate equals v0.
Calculate the change in the reaction rate that will be observed when the concentration
of A will be tripled.

What record? the question is incomplete

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.