The hydrilla, a non-native species of the hudson river estuary, has begun to grow along the surface of the water and spread throughout the watershed. which of the following is true of the hydrilla growing in the hudson river estuary?

the hydrilla will be a in increasing the number of phytoplankton in the water.
the hydrilla will increase the amount of natural plant growth in the estuary.
the hydrilla is an invasive species, and its presence will have an overall negative effect on the estuary.
the hydrilla needs to be trimmed back every year.