
| - Protozoa | Þ | Difusi (pada Amoeba) dan vakuola kontraktil (pada Paramaecium). |
| - Coelenterata dan Platyhelmintbes | Þ | Sistem Gastrovaskuler. |
| - Mollusca dan Arthropods | Þ | Sistem Peredaran darah terbuka |
| - Annelida | Þ | Sistem peredaran darah tertutup. |
Pustaka Maya
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