4). The three types of speciation models are, a). Allopatric speciation b). Sympatric speciation c). Parapatric speciation models Adaptive radiation is the diversity of structures of organisms into new forms under new favorable environmental conditions (Eg: when new food resources are available). The changes of adaptive radiation are rapid and results in phenotypic adaptation of morphological and physiological traits. The mechanism of adaptive radiation is known as allopatric speciation, in which one species in particular population differs from all other species (isolated species) and genetic exchange is also prevented among these species. Physical barriers such as a mountain range or long waterways may makes impossible for them to mate. So, these isolated species develop or evolve according to their habitat, because their gene modifications go in that direction (natural selection!). Disruptive selection is one of the main driving forces of sympatric speciation. Sympatric speciation is different and perhaps it does not exist. It occurs when there are no physical barriers that prevent species to mate together. The occurrence of speciation may be depends on availability of different food sources and existence of different shelters. By observing the differences in gene pool of two different species (by the analysis of genetic drift and recombination), we can tell the factors that led to speciation. Parapatric speciation is also a rare type of speciation which occurs due to the extreme changes in the habitat, but not due to physical barriers. Most evolutionary biologists such as Darwin agreed with the existence of allopatric speciation. Charles Darwin was the initial scientist to elucidate the eminent role of natural selection in speciation. Natural speciation and Darwin observations: Allopatric speciation (from the ancient Greek allos, \"other\" + Greek patra, \"fatherland\") or geographic speciation is speciation that occurs while biological populations of the same species become vicariant. For instance, adaptive radiation, as observed by Charles Darwin in Galapagos finches, is a consequence of allopatric speciation in the midst of island populations. Solution 4). The three types of speciation models are, a). Allopatric speciation b). Sympatric speciation c). Parapatric speciation models Adaptive radiation is the diversity of structures of organisms into new forms under new favorable environmental conditions (Eg: when new food resources are available). The changes of adaptive radiation are rapid and results in phenotypic adaptation of morphological and physiological traits. The mechanism of adaptive radiation is known as allopatric speciation, in which one species in particular population differs from all other species (isolated species) and genetic exchange is also prevented among these species. Physical barriers such as a mountain range or long waterways may makes impossible for them to mate. So, these isolated species develop or evolve acco.

1. 4). The three types of speciation models are,
a). Allopatric speciation
b). Sympatric speciation
c). Parapatric speciation models
Adaptive radiation is the diversity of structures of organisms into new forms under new
favorable environmental conditions (Eg: when new food resources are available). The changes of
adaptive radiation are rapid and results in phenotypic adaptation of morphological and
physiological traits.
The mechanism of adaptive radiation is known as allopatric speciation, in which one species in
particular population differs from all other species (isolated species) and genetic exchange is also
prevented among these species. Physical barriers such as a mountain range or long waterways
may makes impossible for them to mate. So, these isolated species develop or evolve according
to their habitat, because their gene modifications go in that direction (natural selection!).
Disruptive selection is one of the main driving forces of sympatric speciation. Sympatric
speciation is different and perhaps it does not exist. It occurs when there are no physical barriers
that prevent species to mate together. The occurrence of speciation may be depends on
availability of different food sources and existence of different shelters.
By observing the differences in gene pool of two different species (by the analysis of genetic
drift and recombination), we can tell the factors that led to speciation.
Parapatric speciation is also a rare type of speciation which occurs due to the extreme changes in
the habitat, but not due to physical barriers.
Most evolutionary biologists such as Darwin agreed with the existence of allopatric speciation.
Charles Darwin was the initial scientist to elucidate the eminent role of natural selection in
speciation.
Natural speciation and Darwin observations:
Allopatric speciation (from the ancient Greek allos, "other" + Greek patra, "fatherland") or
geographic speciation is speciation that occurs while biological populations of the same species
become vicariant. For instance, adaptive radiation, as observed by Charles Darwin in Galapagos
finches, is a consequence of allopatric speciation in the midst of island populations.
Solution
4). The three types of speciation models are,
a). Allopatric speciation
b). Sympatric speciation

2. c). Parapatric speciation models
Adaptive radiation is the diversity of structures of organisms into new forms under new
favorable environmental conditions (Eg: when new food resources are available). The changes of
adaptive radiation are rapid and results in phenotypic adaptation of morphological and
physiological traits.
The mechanism of adaptive radiation is known as allopatric speciation, in which one species in
particular population differs from all other species (isolated species) and genetic exchange is also
prevented among these species. Physical barriers such as a mountain range or long waterways
may makes impossible for them to mate. So, these isolated species develop or evolve according
to their habitat, because their gene modifications go in that direction (natural selection!).
Disruptive selection is one of the main driving forces of sympatric speciation. Sympatric
speciation is different and perhaps it does not exist. It occurs when there are no physical barriers
that prevent species to mate together. The occurrence of speciation may be depends on
availability of different food sources and existence of different shelters.
By observing the differences in gene pool of two different species (by the analysis of genetic
drift and recombination), we can tell the factors that led to speciation.
Parapatric speciation is also a rare type of speciation which occurs due to the extreme changes in
the habitat, but not due to physical barriers.
Most evolutionary biologists such as Darwin agreed with the existence of allopatric speciation.
Charles Darwin was the initial scientist to elucidate the eminent role of natural selection in
speciation.
Natural speciation and Darwin observations:
Allopatric speciation (from the ancient Greek allos, "other" + Greek patra, "fatherland") or
geographic speciation is speciation that occurs while biological populations of the same species
become vicariant. For instance, adaptive radiation, as observed by Charles Darwin in Galapagos
finches, is a consequence of allopatric speciation in the midst of island populations.