The physical characteristics are the attributes that are visible on the outside. They are included in the phenotype of the organism. Thus, option d is correct.
What is phenotype?
A phenotype is an observable characteristic that can be in the form of morphology, structure, appearance, and behavior. The phenotypical traits are defined and caused by the expression of the genotypical traits that are controlled by the inherited genes.
The phenotype includes hair color, eye color, height, weight, blood cells, earlobes, freckles, etc. It differs from a genotype as it is not a genetic code but an expressed or visible characteristic. It is controlled by the expression of genes and environmental factors.
Therefore, option d. the phenotype is the physical characteristics of an organism.
Learn more about phenotype here:
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