The correct option is C Interdependence between plants and animals.
There is an interdependence between plants and animals. In an ecosystem, plants act as producers and animals including humans are consumers. Plants produce their food by the process of photosynthesis but animals are incapable of doing so. Therefore, animals feed on plants to get their nutrition and energy. Also, plants take in carbon dioxide and give out oxygen in the process of photosynthesis and animals take in oxygen during respiration and give out carbon dioxide.