Warm and cool air masses meeting near the South Pole.
I think the correct answer from the choices listed above is option C. Cyanobacteria is responsible for allowing higher life forms to evolve by releasing oxygen, which created the ozone layer, resulting in reduced mutation rate.<span />
Crenation is likely to occur in blood cells immersed in a solution of low water potential ( hypertonic solution) . The cytoplasm has higher water potential than outside solution, water leaves by osmosis. The cell shrinks and little spikes appear on the cell surface membrane. This process is called crenation. An animal cell will become dehydrated and eventually die when placed in a cell of lower water potential.
A. Lubricating cartilage at joints
