Carbon is transferred from plants to animals through the process of photosynthesis and cellular respiration. Plants use the energy from sunlight to convert carbon dioxide and water into glucose, which is a form of sugar. Animals then eat the plants and use the glucose for energy. As animals breathe, they release carbon dioxide into the atmosphere, which is then used by plants to start the process over again.

Here is a more detailed explanation of the process:

1. Photosynthesis: Plants use the energy from sunlight to convert carbon dioxide and water into glucose, which is a form of sugar. This process takes place in the chloroplasts of plant cells.

2. Cellular respiration: Animals eat the plants and use the glucose for energy. This process takes place in the mitochondria of animal cells.

3. Respiration: As animals breathe, they release carbon dioxide into the atmosphere. This carbon dioxide is then used by plants to start the process of photosynthesis over again.

This process is essential for life on Earth, as it allows carbon to be recycled between the atmosphere, plants, and animals. Without photosynthesis, plants would not be able to produce the food that animals need to eat, and without respiration, animals would not be able to release the carbon dioxide that plants need to grow.