Allopatric<span> speciation occurs when new species arise as a result of geographic isolation from the ancestral species. It involves an extrinsic barrier to gene exchange and can occur by a number of means including subdivision or peripheral division.</span>
The emergence of resistance is a result of EVOLUTION by natural selection. It is a major evolutionary force.
<h3>Evolution and natural selection </h3>
The term evolution refers to the biological process of descendence with modification.
Natural selection refers to the differential survival or reproduction of the organisms better adapted to a given environment.
In this case, the presence of the pesticide generates an evolutionary constraint, thereby selecting pesticide-resistant individuals in the population.
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The nuclide represented as X is thorium and this is an alpha decay where an alpha particle is removed off.
<h3>What is nuclide?</h3>
A kind of atom or nucleus which is represented by a specific number of protons and neutrons.
The equation given represents an alpha decay. In an alpha decay, an alpha particle is removed off.
The atomic number of the parent nuclide is more than the daughter nuclide by two units and the mass number of the parent is more than that of the daughter nuclide by four units.
Thus, the x is thorium.
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I believe wilderness, but you can go online and research it just to make sure !
