perpendicular to animal-vegetal axis, it cleaves oblique to this axis and typically produces a quartet of cells that come to lie not on top of each other but in furrows between the cells oTypical of molluscs, annelids, and other protostomesoSpirally cleaving eggs tend to pack their cells tightly together much like a cluster of soap bubbles rather than just lightly contacting each other Part 2 - Protozoa
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IntroductionoOccurs wherever life existsoHighly adaptable oRequire moistureoSessle or free swimming 1. Protozoans defy tidy characterization - Diversity in form and function rivals almost all other animals combined2. Despite apparent simplicity, protozoans are as complex as any metazoans•i.e. a single cell capable of feeding/digesting, locomotion, “behaving” and reproducing•possess organelles not general found in metazoan cells3. Few other groups rival protozoans in economic importance•primary production and in decomposition•human/animal health (malaria/dysentery/sleeping sickness) Locomotion•move chiefly by cilia and flagella and by pseudopodial movement•Three mechanisms of locomotion in Protozoa (not mutually exclusive) 1.Ciliary motiona.Cilia : hair-like outgrowths from body/cell wall a.i.Fastest ciliates up to 720 cm/ha.ii.Propels water parallel to surface to which cilium is attached2.Flagellar motiona.Flagella : whip-like outgrowths from body/cell walla.i.Fastest flagellate up to 72 cm/ha.ii.
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