14. Brainstorm and write at least 3 potential challenges or important points to consider when conducting the described data collection

Variables,control,conclusion and finally scientific theory

Wagons/motorized vehicles

The correct answer is weight.

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.