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1. Describe how the size of the blastomere (cell) in the 4 cell stage compares with the fertilized egg of a sea

urchin.



2. Label the Gastrula with the following terms. Archenteron; blastopore; ectoderm; endoderm.


3.What is body symmetry? Describe how the body symmetry of the adult sea urchin evolved or changed from the symmetry of the pluteus larval stageScreen Shot 2019-12-01 at 7.19.57 AM.pngScreen Shot 2019-12-01 at 7.20.26 AM.png

Screen Shot 2019-12-01 at 7.19.57 AM.png

4. In the table below, place 2 or more adult structures under the primary germ layer that it was derived
from. Be specific of the location of the tissue (such as lining of the lung).

Screen Shot 2019-12-01 at 7.20.26 AM.png

1. Draw and label the following stages in the boxes below. 2 cell stage, 4 cell stage, morula stage, blastula stage

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