Yes, elephants can hear through their feet only when their is danger or signal. Isn't it amazing?
Animals that live in estuaries need to adapt to changing salinity levels and the rising and falling of tides. Adaptation is the result of evolution.
<h3>Evolution and adaptation</h3>
The term 'evolution' refers to descendence with modification, which is mainly achieved by natural selection.
Adaptation refers to the process of adjustment that makes organisms in order to fit certain environmental conditions.
Natural selection is the differential survival and reproduction of the organisms better adapted to their environment.
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Even a country in which the birthrate and death rate are equal can experience population growth if it also has immigration.
- In evolutionary time, migration will often quickly converge gene frequencies among populations. Migration is a powerful mechanism for balancing the gene frequencies of subpopulations in a species in the absence of selection. Gene frequencies will eventually equalize if the migration rate is larger than zero.
- Migration refers to the movement of people, groups, or populations. Migration facilitates gene flow, or the transfer of genes from one population to another, in terms of genetics. Migration—or, to be more precise, gene flow—alone will quickly bring the gene frequencies of the two populations together if they initially had distinct gene frequencies and if selection is not at work.
Therefore, immigration is the correct answer.
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The question is incomplete but antivirals, cells of the immune system and antibodies can work against viral infection.
<h3>What is a viral infection?</h3>
A viral infection is any disease caused by a virus that is able to infect and produce harm to a suitable host.
The immune system consists of different barriers to fight against viral infections, one of which is composed of immune cells and antibodies that work together to recognize and destroy pathogenic viruses.
For example, the cells that can work against a viral infection include cytotoxic T cells, macrophages and NK cells.
In conclusion, antivirals, cells of the immune system and antibodies can work against viral infection.
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