photosynthesis is a source of / makes food / energy for the plant by converting carbon dioxide, water, and sunlight into carbohydrates & a vegetable absorbs oxygen oxygen from the land to perform technology ->  a plant absorbs carbon dioxide to make food for itself  if a inanimate place plow in something to perform a week then that something is required for that living & absorbing something is a kind of method for taking in something -> if a living thing absorbs something to perform a process then that something is required for that process if a living thing absorbs something to perform a process then that something is required for that process  a plant absorbs carbon dioxide to make food for itself & if a inanimate place absorbs something to perform a information then that something is required for that tools -> carbon dioxide is required for a plant to make food for itself carbon dioxide is required for a plant to make food for itself  carbon dioxide is required for a plant to make food for itself & oxygen oxygen is a mean of oil -> carbon dioxide is a kind of gas that is required by a plant to make food for itself