Genes provide the blueprint:

* DNA: Genes are segments of DNA that contain the instructions for building and maintaining an organism. They determine things like:

* Physical traits: Height, eye color, hair color, etc.

* Cellular processes: How cells divide, differentiate, and function.

* Metabolic pathways: How the body processes food and energy.

Environment plays a crucial role:

* Nutrition: Adequate nutrition is essential for growth and development.

* Physical activity: Exercise and movement can influence muscle growth and bone density.

* Exposure to sunlight: Sunlight is necessary for vitamin D production, crucial for bone growth.

* Social environment: Social interactions can impact stress levels and mental health, which indirectly influence growth.

* Epigenetics: Environmental factors can influence how genes are expressed, even without changing the underlying DNA sequence. This means the environment can "switch on" or "switch off" certain genes.

Examples of environmental influence:

* Malnutrition: A child who lacks adequate nutrition will not reach their full growth potential, even if they have genes that predispose them to be tall.

* Exercise: Weightlifters can significantly increase muscle mass through exercise, regardless of their genetic predisposition for muscle growth.

* Stress: Chronic stress can inhibit growth and development.

Conclusion:

Genes are fundamental for growth and development, but the environment significantly influences how these genes are expressed and how an organism ultimately grows. It's a complex interplay between nature (genes) and nurture (environment).