Reason a is the correct one, as the european union has nothing to do with protection from invasions and Germany reunified many years ago.
globalization has led to an improvement in standard of living through improved roads and transportation, improved health care, and improved education due to the global expansion of corporations.
The principle of states that the physical, chemical, and biological processes at work shaping the earth today have also operated in the geologic past is uniformitarianism.
<h3>What is
biological system?</h3>
- A biological system is a complex network which connects several biologically relevant entities.
- Biological organization spans several scales and are determined based different structures depending on what the system is.
- Examples of biological systems at the macro scale are populations of organisms.
- On the organ and tissue scale in mammals and other animals, examples include the circulatory system, the respiratory system, and the nervous system.
- On the micro to the nanoscopic scale, examples of biological systems are cells, organelles, macromolecular complexes and regulatory pathways.
- A biological system is not to be confused with a living system, such as a living organism.
<h3>What in nature is biological?</h3>
- All of the branches of the natural sciences that focus on different facets of life's processes are included in the biological sciences.
- The notion spans all species, from bacteria to animals and plants, and incorporates anatomy, physiology, cell biology, biochemistry, and biophysics.
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Answer:
Moon
Explanation:
Our planet, Earth, has a single satellite: <u>the Moon</u>.
