Cells become variable in morphology and function in different regions of the embryo. The process is:

Explanation

The correct answer is "a. differentiation." Here's an explanation of each option: a. Differentiation: Differentiation is the process by which cells in an embryo become specialized or take on specific roles and functions. During embryonic development, as cells divide and multiply, they start to change in structure and function to form the various types of cells and tissues needed for the different parts of the body. This process allows cells to become distinct, specialized cell types like muscle cells, nerve cells, and skin cells, each with their own unique morphology and function. b. Metamorphosis: Metamorphosis is a biological process typically associated with the transformation of an organism from one life stage to another, such as the transformation of a caterpillar into a butterfly. It's not a process that occurs during embryonic development. c. Organisation: Organization is a general concept and can refer to various processes in embryonic development. However, it does not specifically describe the process of cells becoming variable in morphology and function. Instead, organization may refer to how cells are arranged and interact to form tissues and organs. d. Rearrangement: Rearrangement suggests a process involving the movement or repositioning of cells or structures. While this can occur in embryonic development, it doesn't capture the full scope of how cells become variable in morphology and function. Summary and hints: During embryonic development, cells go through a process called "differentiation" to become specialized and take on specific roles and functions. Differentiation involves the transformation of undifferentiated cells into distinct cell types with unique structures and functions. Metamorphosis is not related to embryonic development but typically refers to transformations in the life cycle of certain organisms. Organization and rearrangement are processes that can occur during embryonic development, but they don't directly address the concept of cells becoming variable in morphology and function. n the context of the question, "differentiation" is the most relevant and accurate option for describing how cells become variable in morphology and function during embryonic development.