Sponge larvae are more animal-like than adult sponges because

Sponge larvae are more animal-like because these larvae are free-swimming organisms. These sponges have no nervous systems, digestive systems or any circulatory systems but they depend on the constant water flow through the bodies. Their reproduction is done through both sexually and asexually.

Sponges are organisms that are members of phylum prolifera, they are simple multicellular animals without a mouth, muscles, heart or brain. Sponges's tissues contains collar cells and amoebaocytes in its tissues. They feed by drawing water in through their pores and filter out food particles. Sponge larvae are more animal-like than adult sponges because they are free-swimming organisms.