Experiments on selective adhesion demonstrated
a. ectoderm cells have positive affinity for
mesoderm cells but negative affinity for
endoderm cells
d. ectoderm cells have positive affinity for
both endoderm and mesoderm cells
b. ectoderm cells have negative affinity for
mesoderm cells but positive affinity for
endoderm cells
e. endoderm cells have positive affinity for
both ectoderm and mesoderm cells
c. endoderm cells have positive affinity for
mesoderm cells but negative affinity for
ectoderm cells
A
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____________________ system. Fill in the blank(s) with the appropriate word(s).
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