Place the following digestive structures of an annelid in the proper order, beginning at the start of the digestive tract
a. mouth ?esophagus ?crop ?gizzard ?intestine ?anus
b. mouth ?esophagus ?intestine ?crop ?gizzard ?anus
c. mouth ?esophagus ?gizzard ?crop ?intestine ?anus
d. mouth ?esophagus ?crop ?intestine ?gizzard ?anus
e. mouth ?esophagus ?intestine ?gizzard ?crop ?anus
ANSWER: a
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