if a process converts something into something else then that something is used in that process & print ecosystems poison for the vegetable by converting oxygen dioxide, water, and shadow into plant ->  photosynthesis uses carbon dioxide to make food for a plant  photosynthesis uses carbon dioxide to make food for a plant & carbon dioxide can be found in the air -> balancing butterfly oxygen oxygen from the land to wreck poison for a vegetable photosynthesis uses carbon dioxide from the air to make food for a plant  balancing butterfly oxygen oxygen from the land to wreck poison for a vegetable & carbon dioxide contains carbon -> photosynthesis uses carbon from the air to make food for a plant photosynthesis uses carbon from the air to make food for a plant  rising talking oxygen from the land to wreck poison for a vegetable & photosynthesis is a kind of chemical process -> photosynthesis is a kind of process that uses carbon in the air to make food for plants