Explanation:
2. distribution and abundance of organisms
3. speciation of plants
4. Antarctic convergence
Geographical isolation is the physical barrier dividing the communities. It usually stops the gene flow between species in a process called allopatric speciation, contributing to reproductive isolation.
Further Explanation:
Spontaneous modifications within the genome may arise during the cycle of cell division, called mutations. These errors occur as copies of the DNA are produced within the cell; mutations may range from small modifications, called single nucleotide polymorphisms, to large-scale deletions and multi-gene additions.
These mutations form variants which, within a population, become stable, resulting in the formation of separate, genetically distinct populations called species. Apart from allopatric speciation, new species arise through several other evolutionary mechanisms such as:
- peripatric speciation— like allopatric speciation, however, one group is much smaller, making the unique characteristics more notable, or distinct
- parapatric speciation— sub-populations in a large geographic region develop reproductive isolation by mating with those nearby, but continue to undergo reproductive isolation;
- sympatric speciation-absence of physical barriers that impede the passage of genes; reproductive segregation by many variants of the same genes called polymorphisms
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Answer:
bathing,cooking,washing clothes , cleaning, drinking
Explanation:
<u>Answer</u>:
All of these are the most important source of of nitrogen that can lead to eutrophication of aquatic ecosystems
<u>Explanation</u>:
Eutrphication is process where the amount of nutrients in the aquatic system increases. The two major source of nutrients or minerals that causes eutrophication is Nitrogen and Phosphorus. The nitrogen or Phosphorus promotes the growth of phytoplanktons. These phytoplanktons covers the surface of the aquatic system thereby leading to decrease in the amount of oxygen in the system. The runoff from the agricultural lands contains the particles of fertilisers used for the crops.Usually those fertilizers like Urea are made up of Nitrogen and phosphorus. Also the sewage water too contains nitrogen in it.
Answer:
c- they all have a common line of ancestry