Answer: Oxygen and Food/Nutrients
Explanation:. 1. Oxygen: Through the process of photosynthesis, plants absorb carbon dioxide from the atmosphere and release oxygen as a byproduct. This oxygen is essential for animals as they require it for respiration. Animals inhale oxygen and exhale carbon dioxide, creating a symbiotic relationship with plants. They provide plants with carbon dioxide, which is essential for photosynthesis, and in return, plants release oxygen that animals need to survive.
2. Food/Nutrients: Plants produce fruits, seeds, nectar, and other plant parts that serve as food sources for animals. Fruits contain seeds that can be consumed by animals, allowing them to disperse the seeds and help in the plant's reproduction. Nectar produced by flowers attracts pollinators like bees, butterflies, and birds, providing them with a source of energy. In return, these pollinators help plants in the process of pollination, aiding in the production of fruits and seeds.