DEFINITIONS AND KEY POINTS FOR OBJECTIVES
| TERMS | DEFINITIONS |
| Polyphyletic | Groupsof organisms having separate origin are called polyphyletic. |
| Pellicle | A regular arrangement of microtubules is called the pellicle. |
| Osmoregulation | The maintenance of water and salt balance in the body is called osmoregulation. |
| Symbiosis | Symbiosis is an intimate association between two organisms. |
| Parasitism | An association in which one organism lives in or on a second organism, host and causes disease in the host is called parasitism. |
| Commensalism | The symbiotic relationship in which one member of the relationship benefits and the second member are neither benefited nor banned is called commensalisms. |
| Mutualism | The symbiotic relationship in which both species benefit is called mutualism. |
| Proto-zoologists | Zoologists who specialize in the study of protozoa are called proto-zoologists. |
| Cirri | The cilia join to form cirri |
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