The reason the number of zooplankton in the Hudson River increased was because of D. the decline in the number of large zebra mussels
Large Zebra Mussels:
- Feed on zooplankton
- Were decreasing in the Hudson River
- Were dying at a faster rate and at a younger age
Because the large zebra mussels - zooplankton eaters - were dying out, the zooplankton were able to make a comeback and increase their populations.
In conclusion, option D is correct.
Find out more about zooplankton at https://brainly.com/question/815977.
