There is photosynthesis. Photosynthesis is the process of capturing the sunlight's energy and making it into sugar, otherwise known as sugar. This process only happens in plant cells. This process takes place in chloroplast, an organelle only found in plant cells. This process requires the carbon dioxide we breathe out and the energy from the sun. It produces water, glucose, and oxygen for us to breathe. Photosynthesis is how plants feed themselves.
Another process is cellular respiration. Every living thing does this process. It takes place in mitochondria, an organelle in every cell. This requires water, glucose, and oxygen. It produces carbon dioxide and energy that you use. Cellular respiration is how we get our energy.
As you can see, cellular respiration is a process that is basically photosynthesis, but reversed. God purposefully made it that way. Plants give us the oxygen we need, while we give them the carbon dioxide they need. We exchange materials to keep us alive. This is the cell cycle.
Without photosynthesis, we wouldn't be able to breathe, since plants produce oxygen through that process. Plants would die because they wouldn't have any glucose to consume. Plants would decrease, meaning that there would be less food for herbivores. They would die, and soon, we would die. This is called a food chain.
Without cellular respiration, we wouldn't have energy, since cellular respiration produces energy. Plants wouldn't get the carbon dioxide they need in order to perform photosynthesis. If you take away one of the processes, the whole cycle will not work.
Romans 1:20
For since the creation of the world God’s invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that people are without excuse.
God was very thorough and detailed with His work. He made everything perfectly and exactly. There is no flaw in His creation.
