There are many reasons why researchers use mice as animal models in science and medicine. A huge reason why mice are used is that their genetics and behavioral characteristics are very close to humans. So, having an animal model for Huntington’s Disease would help scientists be able to study the disease further and make advancements in treatment options in a far less costly and a much safer way than studying it in humans. Mice as animal models can also help in a huge way because their lifespans are very short compared to humans (they only live about 2-3 years). This allows scientists to be able to study the affects of the gene over many generations in a much shorter amount of time.
While the cuticle has several advantages such as protection, they do not confer much advantage to larger eukaryotes. This is because of their limiting factor to growth (size). The cuticle would also restrict development of different skin structures such as fur. Additionally, while the cuticle provides leverage for muscular movements on arthropods, nematodes, and flatworms, it is not necessary for larger animals since the same function is rendered by the endoskeleton.
Cells are affected by the movement of water through osmosis. Osmosis is a natural phenomenon in which molecules move from lower concentration to higher concentration. This movement depending on the solution type of the environment can either shrink or burst or oversaturate a cell.