Respond to statements 103–107 with reference to the five terms
below.
a. somites
b. blastomeres
c. ectoderm
d. mesoderm
e. endoderm
M 103. This is the first primary tissue layer to form.
E 104. It forms between the other two primary tissue layers.
M 105. These are the source of most bones and the skeletal
muscle of the head and trunk.
M 106. These reorganize themselves into the gastrula.
E 107. This starts the gut’s inner lining.
Answers: 103. c, 104. d, 105. a, 106. b, 107. e
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