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Digestive System › ViewWhich two systems interact so the kidneys filter cellular waste out of blood for removal?
A. circulatory and endocrine
B. respiratory and circulatory
C. digestive and respiratory
D. circulatory and excretory
Human Body › View
During cold weather or when frightened, hair on our skin stand. why?
A. pilimotor muscles contract and pull the base of the hairs
B. skin contracts
C. hairs becomes hard and appears standing
D. the cold weather makes the hairs elongate and stand