★ Excretory System Quiz
What is the main function of the excretory system?
A. to collect and remove wastes from the body
B. to strengthen skeletal muscles
C. to protect the nervous system
D. to bring oxygen to body cells
Select your answer:
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Dermatology › ViewThe most common cause of canine pyoderma?
A. E.coli
B. Staphylococcus intermedius
C. Mites
D. Demodex
Blood & Blood Vessels › View
Which statement about veins is correct?
A. They all carry deoxygenated blood
B. .They carry blood away from the heart.
C. They have thick muscular walls.
D. They have valves to prevent backflow.