phloem contains specialized cells that move sugars and other nutrients both up and down in plants. Which object is the best model of one of these cells

Which type of respiration takes place when there is no oxygen present

Photosynthesis uses co2 and cellular respiration produces co2. we call the point when the two processes are in balance--when there is no net production of co2--the compensation point. how might you limit one of the processes in order to achieve a compensation point?

How dose plate tectonics effect climate