★ Biology Quiz
a series of rhythmical muscular contraction and relaxation of the digestive canal muscles
A. digestion
B. nutrition
C. cellular respiration
D. peristalsis
Select your answer:
Topics:
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Human Body Systems › View
If something goes wrong with the thyroid in this organ system, one can get goiter.
A. Immune system
B. Endocrine system
C. Cardiovascular system
D. Integumentary system
Anatomy - Cellular Respiration › View
What gas is released by plants during photosynthesis?
A. sulfur
B. carbon dioxide
C. oxygen
D. hydrogen