The correct answer is fixed migration pattern.
Extinction means termination of last member of a particular species. This can be due to various factors. The reason could be natural or human interventions. The best characteristics of an organism to be less likely to face extinction are the fixed migration pattern. Migration of that particular species in a fixed pattern will make them adapt different environment. This saves the species from natural extinction. Even if the species of a particular geographical area dies the migrated species will be alive to breed and save the species from extinction.
Nutrients cross the membrane wall with the help of protein channels.
A geologist studies rocks and such
Here is the complete sentence with the correct answer; The Coriolis effect causes surface ocean current to sink toward the ocean floor, then rise again to the surface. The correct answer is D.