How would a visual effects designer working on an animated movie with human characters best use knowledge of biology?

As an AI language model, I don't have personal experience so I can't provide a guarantee that this will be used by all visual effects designers, however, here are some ways:

1. Understanding anatomical and physiological differences between different humans: Visual effects designers can use their knowledge of biology to create realistic animations of human characters. For example, they can use their knowledge of the differences in muscle structure and movement between men and women to create more realistic movement and expressions in their characters.

2. Creating more lifelike movements: Visual effects designers can use their knowledge of biology to create more lifelike movements in their animations. This can involve studying how humans move and interact with their environment, and replicating those movements in their characters.

3. Developing realistic expressions: By understanding the underlying muscle structure and physiology of human faces, visual effects designers can create more realistic expressions in their characters. This can involve studying the subtle movements of the facial muscles during emotional expression and recreating those movements in their characters.

4. Understanding biological processes: In order to create realistic animations of human characters, visual effects designers may need to understand basic biological processes such as how muscles function and the mechanics behind the respiratory system. By understanding these processes, they can create more realistic animations of their characters in action.

Overall, knowledge of biology can be incredibly useful for visual effects designers working on animated movies with human characters. It can help them to create more realistic and lifelike animations, which can enhance the overall viewing experience for audiences.