Similarities:
Both involve ion movement. Both use ion channels to move ions across the cell membrane, in or out of the cell.
Differences:
Passive Transport (or Diffusion) moves ions from high concentration to low, using no metabolic energy. Active Transport moves ions from low concentration to high, using metabolic energy in the form of ATP. Active Transport uses an ion pump (or Sodium/Potassium pump) to move 3 sodium ions out of the cell and 2 potassium ions in to the cell through the energy of 1 ATP molecule.
Answer:
arthrodesis
Explanation:
Arthrodesis is also known as artificial ankylosis ans is a surgaical method to fuse the bone in a joint. This method is used when all other methods are not working and is mainly opted in case mobility of joint is affected. Arthrodesis is a painless method unlike the other joint related surgical methods. It provides a more permanent solution to joint related issues as the replacement joints implanted have the same level of motion as that of natural joints and hence it is a more viable solution as compared to other joint replacement surgeries.
Answer: Kingdom
Explanation:
The linnaean system of classification used in taxonomy start from highest (most general category) to the lowest level as follows: Kingdom --> phylum/division --> class --> order --> family --> genus --> species.
Thus, since the first level (Kingdom) require species to have the least number of common features, the most species are found in it.
For instance: living organisms of all species are classed into just 5 kingdoms whereas over a billion species exist.