* Genetics: Our genes provide the blueprint for our traits. They determine things like our eye color, hair color, predisposition to certain diseases, and basic body structure.

* Environment: The environment plays a crucial role in shaping how our genes are expressed. This includes:

* Physical Environment: Things like diet, climate, and exposure to toxins can all influence how our genes function.

* Social Environment: Social interactions, stress, and even our experiences can alter gene expression.

Let's look at why the other options are incorrect:

* a) Genetics: While genetics is essential, it's not the sole factor. The environment plays a significant role in how our genes are expressed.

* b) Genetics, cytoplasmic determinants: Cytoplasmic determinants are molecules within the cytoplasm of an egg that can influence development, but they primarily affect early stages of development. They are not the only factor determining individual features.

* d) Environment, individual needs: While individual needs are influenced by our genes and environment, they are not the primary drivers of our features.

In summary: Individual features are a complex interaction between our genetic inheritance and the environmental factors that shape us throughout our lives.