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-       Larger cell have smaller SA:Vol Ratio-       Difficulty in exchange materials-       Multicellular more efficient-       Revisit – transfusion, osmosis, active transport

The loop of henle is a region of the kidney's nephrons which through active and passive transport of Na+ and Cl- ions lowers the water potential of the kidney's medulla, allowing greater reabsorbtion of w...

Osmosis is the net movement of water from an area of high water potential to an area of lower water potential through a partially permeable membrane.An area of high water potential means there is less sol...

Natural selection is one of the fundamental mechanisms of the process of evolution. There are 4 key things to remember about the process of natural selection.1) There is genetic variation within a populat...

Now the first thing to point out when looking at images under an electron microscope is the scale. For example, something that you draw as 3cm long, may in fact be 10, 000 times smaller in real life. So i...