Question

sponge knowledge check
a main source of food for sponges are microscopic
merryplankton
zooplankton
phytoplankton
hollowplankton

Explanation:

Sponges are filter - feeders. Zooplankton are microscopic animals that are a main food source for sponges. Phytoplankton are plant - like and not the main food source. "Merryplankton" and "hollowplankton" are not real biological terms.

Answer:

B. zooplankton