Choanocytes followed by amoebocytes:

Choanocytes are specialized cells in sponges that line the inner surface of the sponge's body. They have a collar of microvilli surrounding a flagellum, which creates water currents and helps in capturing food particles.
- The choanocytes trap food particles suspended in the water that enters through the pores of the sponge.
- After trapping the food particles, the choanocytes engulf them through phagocytosis.
- Once the food particles are engulfed, the choanocytes digest them partially.

Amoebocytes:

Amoebocytes are another type of specialized cells found in sponges, and they play a crucial role in digestion.
- After the choanocytes partially digest the food particles, they transfer the partially digested food to the amoebocytes.
- Amoebocytes further digest the food particles and distribute nutrients to other cells of the sponge for energy and growth.
- They also help in the transportation of nutrients and waste within the sponge's body.

Overall process:

The digestion of food in a sponge like Leucosolenia involves a coordinated effort between choanocytes and amoebocytes. The choanocytes capture and partially digest food particles, while the amoebocytes complete the digestion process and distribute nutrients to sustain the sponge's life functions. This process highlights the unique feeding mechanism of sponges and their reliance on specialized cells for digestion and nutrient absorption.