Enjoy the crosswords challenge in our free daily puzzles, from the harder Sunday crossword to the quicker daily. More >>. Every Sudoku has a unique solution that can be reached logically. Enter numbers into the blank spaces so that each row, column and 3x3 box contains the numbers 1 to 9. More >>.
Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism. The remaining 99-99.5% is lost by transpiration. Leaf surfaces are dotted with pores called stomata, and in most plants they are more numerous on the undersides of the foliage.
The most common examples of respiration occur in two places: in human lungs as part of breathing and in cells through a process called cellular respiration. Humans breathe to oxygenate their blood, and cells breathe to acquire oxygen to be able to break down glucose for the energy that they need.