A population that has been isolated, especially a smaller one, could have a high level of homozygosity and therefore not a lot of genetic variation. Gene flow between such populations can increase the level of heterozygosity, and therefore up genetic variation.
Option C would be correct. The organ system can plays many parts at one time. Also, it is the only system listed.
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Some blood cells responsible for the transportation of oxygen and other are there for rebuilding of tissues. Fights things the body doesn't recognize
Runner B took about 13.3 mins per mile while Runner A took about 15 mins per mile so runner be ran faster
There is proof of millions of other galaxies, and there is hope for other life, but there is no real knowing of other life in any other galaxy than ours.