Answer
C.
Work Step by Step
Control over gene expression drives embryonic development of complex, multi-celled animal bodies. These gene expression controls allow cells to respond appropriately to environmental change.
As an animal embryo develops, its cells differentiate and form tissues, organs, and body parts. The entire process of development is driven by cascades of master gene expression.
In essence, control over gene expression is critical for differentiation and development in complex, multi-celled eukaryotes.
