Answer:
The plants make food by the help of photosynthesis by using the carbon dioxide, water, sunlight to make food. This food is used by the plants and other organisms.
The animals eat these plants and obtain energy from it. This is how the animals obtain energy from the plants.
The animals exhale carbon dioxide which is used by the plants for the process of photosynthesis. When animals die in the soil the decomposers bring back the nutrients into the soil for utilization by plants. This is how the animals helps plant to obtain energy.