Zebra muscles and invasive species of mollusk originally from Russia have been introduced to the lake after being carried out of the hulls of the boats. An assessment of the size of the zebra muscle problem is needed along with suggestions to curb their population growth. What is the main reason for the introduction of zebra muscles and invasive species of mollusk to the lake?
1) To improve the biodiversity of the lake
2) To control the population of other species in the lake
3) Accidental introduction through boat hulls
4) Intentional introduction for research purposes