Plants grow in many different shapes and sizes. Much of their shape depends on an internal structure that is composed of carbon-containing molecules such as cellulose and lignin. Plants that have a strong internal structure can grow larger than other plants because their structure can support their size. Plants obtain the majority of the carbon necessary for building these structural molecules from

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Explanation:

Plants grow in many different shapes and sizes. Much of their shape depends on an internal structure that is composed of carbon-containing molecules such as cellulose and lignin. Plants that have a strong internal structure can grow larger than other plants because their structure can support their size. Plants obtain the majority of the carbon necessary for building these structural molecules from carbohydrates that are synthesized during photosynthesis.

Plants obtain carbon to build their structures by a process known as carbon fixation or photosynthesis. During this process, inorganic carbon in the form of carbon dioxide reacts with water to produce carbohydrate. Radiant energy from the sun is required for the process to go into completion and oxygen is released as a by-product. The entire process can be summarized by the following equation:

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