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they permit exchange between the external atmosphere and the circulatory system.
Circulatory system
The Circulatory System.
Pipes
VEGETABLES
To break down food into nutrients.
Third line of defence, memory, long term protection
No
Sort of depends on just what you mean by "best", but the respiratory system certainly works the closest.
A linear function is a function, or equation, that when graphed, will form a straight line.
what symbol best describes the asymptote of an exponential function of the form F(x)=bx
Motion.