The age of the Earth is around 4.6 billion years old
The answer would be all of the above
<h2>
short definition:</h2>
<u><em> a species is a population or groups of populations that can potentially interbreed freely within and among themselves.</em></u>
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<em><u> Subspecies, are subgroups within a species that have different traits </u></em>
<h2>
long definition</h2>
<em><u>A species is a group of organisms that (in the case of sexually reproducing organisms) can freely interbreed, producing fertile offspring. This definition has its problems, but overall, it encompasses the meaning of the word “species” in biology.</u></em>
<em><u></u></em>
<em><u>A subspecies is, as the name implies, a smaller population within a species that share a particular common trait. Usually a sub species is at least partially genetically isolated from it’s parent species, so that interbreeding is less likely to occur. Most often a sub species is physically separated from the rest of the species, and may have some specific physical differences from the rest of the species. However, they are still able to interbreed with members of the parent population.</u></em>
I looked all over the Internet, and saw that there is another option that you didn't include, and which is actually the correct answer.
Bays best facilitate the building of ports, not these options.
Answer:
Because of its rivers and topography containing Big rivers with hydroelectric potential
Explanation:
Summed up Hydroelectric power is obtained by the water flow moving turbines that generate electric power. This water is obtained from rivers with a high flow generally near mountainous regions, this kind of rivers is all over Europe because of its topography, the Alps and the Ural mountains are home of many hydroelectric plants taking advantage of the rivers flowing down. For example in Austria, the Danube River is used for obtaining Hydroelectric power.
Although the Hydroelectric plants are smaller compared to Asian or Canadian plants, hydroelectric power is still one of the main sources of energy for central Europe, countries like Spain, France, Netherlands, Sweden, Austria take advantage of their mountains and rivers running down them for building the hydroelectric plants.
