The two major cell types in a sponge's tissues are

collar cells and epithelium.

O collar cells and amoebocytes.

amoebocytes and oscula.

epithelium and oscula.

Answer: B. collar cells and amoebocytes

The collar cells have a funnel like collar and a flagellum. Collar cells whip their flagella to make water go through the sponge. Then the water brings nutrients and oxygen, while while also taking out waste and carbon dioxide.

Amoebocytes first deliver nutrients from choanocytes to the other cells, giving rise to eggs. Then they bring phagocytized sperm from choanocytes to eggs.