74 because it is the farthest number from 84
The answer for that would be the p wave it is also one of the fastest
Cordilleras are parallel sets of mountain ranges within the Andes Mountains.
The ecosystem would be harmed, due to the new competition that native phytoplankton-eating organisms would face when the Zebra mussels eat the native specie’s food. This would also affect the phytoplankton population as now that there’s more predators after them, their numbers would decrease faster.
The correct answer is the 2nd choice