BIOL 1002 Chapter : Chapter 23 Animal Diversity I Part 2
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Chapter 23 part 2 (begin material for exam 3: all the remaining animal phyla have _____________ and ___________________ Some species (sea urchins and starfish) have __________________________ but have. The remainder of the animal kingdom is divided into. Its four cells are undergoing cleavages oblique to the original body axis: Its four cells are undergoing cleavages parallel with and perpendicular to the original body axis: The embryo forms of all the phyla we have discussed so far, as well as the protostomes, go through spiral/determinate cleavage. By the time they get to about the ______________ the cells have lost their _______________ and their ________________________. The embryos of the deuterostomes go through radial/indeterminate cleavage. The cells present after the four-cell stage retain their ________________(stem cells) and the ability to develop into any type of cell or even a complete embryo. Outer layer of body is shed periodically. _________________________________- (flat worms, segmented worms and mollusks: platyhelminthes (____________) characteristics:
