A digestive tract is complete if it
a. possesses specialized regions for different
digestive tasks.
b. produces acids and contains enzymes.
c. is a one-way tube with a mouth and an anus.
d. is surrounded by muscle.
e. uses the same opening for ingestion and
egestion.
Answer: c
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Only primates have the ability to communicate by sound
Indicate whether the statement is true or false
Louis Pasteur's experiments disproving spontaneous generation were different from John Needham's in which important way?
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According to levels of organization, the heart would be categorized as in the _______.
a. Organ Level b. Organ System c. Tissue Level d. Cellular level