Question

why has the spread of the herbicide-resistant hydrilla through florida’s waterways resulted in them no longer being navigable by most boats?

Answer 1

The choices can be found elsewhere and as follows:

a.The hydrilla has induced a drought that drained the waterways.
b.The weed clogs propellers that boats use for propulsion.
c.The sticky leaves of the weed hold boats in place.
d.All of the above

I think the correct answer is option A. The reason why waterways were no longer being navigable by most boats would be that the hydrilla has induced a drought that drained the waterways. Hope this helps.

Answer 2

Out of the following given choices;

a.The hydrilla has induced a drought that drained the waterways.

b.The weed clogs propellers that boats use for propulsion.

c.The sticky leaves of the weed hold boats in place.

d.All of the above

The answer is B. The hydrilla plants is considered an invasive species, hence it has no natural enemies.  This, therefore, means is grows unregulated ( also displacing native vegetation) and the fact that it has become herbicide resistance means it grows even in waterway channels (until they are in mass on the water surface) and hinders the navigation by boats.