Body having meshwork of cells, internal cavities lined with food filtering flagellated Cells and indirect development is the characteristics of phylum?
1. Coelenterata
2. Porifera
3. Mollusca
4. Protozoa
Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?
1. | Penguin is homoiothermic while the remaining three are poikilothermic |
2. | Leech is a freshwater form while others are marine |
3. | Songilla has special collared cells called choanocytes, not found in the remaining three |
4. | All are bilaterally symmetrical |