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An organism's _______ describes its genetic composition. An organism's _______ describes its appearance or observable characteristics.
A.
species; heredity
B.
genotype; phenotype
C.
heredity; species
D.
phenotype; genotype

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B. 
genotype; phenotype

Genetic variation determines inherited  differences between individuals . Our height or eye color are inherited from our parents, but our phenotype is also affected by environment such as the food we eat (diet), drugs we take, toxins surrounding us, climate, location, culture, physical accidents and lifestyle.

Answer: Option B

Explanation: Any organism can be defined by two factors one is its genotype and other one is its phenotype.

The genetic composition of the body of an organism can be said as its genotype. The genes are present inside the cell and determines the physical characters of an organism.

The phenotype can be defined as the physical appearance of the organism. Example: height, color of the organism.

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