Modern fishing practices threaten biodiversity mainly through the

a. chemical poisoning of the water.
b. accidental capture of unwanted species.
c. physical destruction of marine habitats.
d. removal of community food supplies.

I think the correct answer from the choices listed above is option D. Modern fishing practices threaten biodiversity mainly through the removal of community food supplies. When people remove a significant amount of fish, portions of the food web are disturbed and can affect a certain ecosystem.

That is true! many fish species traveled to the u.s. because of it.