Organisms use different processes to obtain the energy that they need to perform cellular functions. mc018-1.jpg mc018-2.jpg which is used as an energy source by polar bears and orange trees?

What are the four basic classes of organic molecules how do they differ structurally and functionally

Does mitochondria still meet the definition of a eukaryote why or why not?

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?