Match the following
| Body Cavity | Phylum | ||
|---|---|---|---|
| A. | Acoelom | I. | Platyhelminthes |
| B. | Pseudocoelom | II. | Nematoda |
| C. | Schizocoelomic coelom | III. | Mollusca |
| D. | Enterocoelomic coelom | IV. | Echinodermata |
Find the variance of the following frequency distribution:
| Class Interval | ||||
| 0--4 | 4--8 | 8--12 | 12--16 | |
| Frequency | 1 | 2 | 2 | 1 |