Vitamin A deficiency is the leading cause of preventable blindness in children.
A heterogeneous mixture is a mixture of substances. In this mixture, substances are not chemically bonded just mixed, they're only together.
Examples:
A bowl of different nuts - Many types of nuts together.
A puddle of mud - Water, sand, leaves
Dirt - a bunch of particles held together.
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senescence, such as through injury, poison, disease,..
The answer is capillaries.
C. 60% Because the whole thing has to equal 100 and 100-40 =60