Task: Text Categorization
Input (English): In addition to the respiratory and circulatory systems, this system obeys Murray's law. Cells found in this system include tracheids and vessel elements, the latter of which generally do not appear in gymnosperms. The flow of its namesake sap is driven primarily by transpirational pull, but also by root pressure. It is often contrasted with a type of tissue which transports sugars. For 10 points, name this plant tissue which transports water, contrasted with phloem.
Output (English): Science