Growth:
Growth refers to the increase in size, weight, or volume of an organism over time. It is one of the essential processes in the life cycle of an organism. During growth, cells undergo division and increase in number, leading to an overall increase in the size of the organism. Growth occurs in all living organisms, from plants to animals.

Differentiation:
Differentiation is the process by which cells become specialized and acquire specific functions. It occurs during the development of an organism and is driven by specific genetic programs. Differentiation allows cells to perform specific tasks and contributes to the overall functionality of an organism. For example, in animals, cells differentiate into different types such as nerve cells, muscle cells, and blood cells, each performing a specific function.

Dedifferentiation:
Dedifferentiation is the reverse process of differentiation. It involves the loss of specialized characteristics and the reversion of cells back to a more primitive or undifferentiated state. Dedifferentiation is often observed in plants and certain animals, such as salamanders that can regenerate limbs. It allows for the formation of new cells and tissues, which can then differentiate into specific cell types.

Development:
Development encompasses all the changes that an organism undergoes during its life cycle, from the initial formation of a zygote to the senescence or aging of the organism. It includes processes such as growth, differentiation, and morphogenesis. Development is a highly coordinated and regulated series of events that occur in a precise sequence to form a fully functional organism.

During development, cells divide, differentiate, and organize into tissues and organs. The organism undergoes various developmental stages, such as embryogenesis, organogenesis, and postnatal growth. These stages involve complex interactions between genetic factors, environmental cues, and cellular signaling pathways.

Development is influenced by both intrinsic factors, such as the genetic information encoded in an organism's DNA, and extrinsic factors, such as the availability of nutrients and environmental conditions. It is a dynamic process that ensures the proper formation and functioning of the organism.

In conclusion, development includes all the changes that occur in an organism's life cycle, from seed germination to senescence. It involves processes such as growth, differentiation, and morphogenesis, which contribute to the formation of a fully functional organism.