I think it's environmental and genetic.
No. Generally, one species gives rise to two new species by geographic and reproductive isolation. Separate species mating at best gives nonviable hybrids.
Technically, there could be thousands of answers, as two animals can have the exact same hierarchy except for the species. There can not necessarily be two "closest related species". There are, however, instances where animals of the same species have made different adaptations. Such as in one type of hummingbird living in South America, the female has a longer, more curved beak than that of the male because they feed on different flowers.
"Devolution" is a misunderstanding. Species evolve over time, as mutations appear and spread and individuals reproduce and die. Evolution tends to produce species that are fairly well adapted to their environment, but they cannot be said to be "better" than any other species. "Devolution" is the idea that species may somehow regress or become more primitive, but any such change is simply another example of regular evolution. Evolution is not graded, so one species cannot be said to be more evolved than another.
A pattern of speciation in which most species in an area appear at the same time
Stars appear different from the sun because the sun is closer to the earth and the other stars are further away from the earth so that's why the appear differently when you look at them in the sky!!!!!
No. Generally, one species gives rise to two new species by geographic and reproductive isolation. Separate species mating at best gives nonviable hybrids.
New genes appear in individuals by random mutation.
They can be formed by evolution: A species can't survive in it's environment so it evolves into a more adapted species Two different species can mate: A new species can appear from the offspring of two different species.
In monomorphic species, male and female appear quite similar. In dimorphic species, the males appear quite different from the females. (Life, the science of biology, 7th edition, chapter 23)
they appear because they are extinct
If one wishes to appear online in MSN one has the option to choose who has the ability to see that one is online. There are drop down menus that allow one to appear online or appear offline to different individuals on one's contact list.
The answer to this will vary with different individuals. Some would and others wouldn't. It depends on many factors, including individual beliefs and personalities. It might even depend on how much a person would be paid. Personally, I wouldn't.
There are several species of penguins. A different number of chromosomes can appear in each species. Studied species so far show penguins to have between 30 and 80. Emperor and rockhopper penguins both have 38 chromosomes.
There are so many species of fish and they all differ. There are some in which there appear to be no differences and others that are so different they look like different species. If you define the species then I may be able to tell you how to sex them.
distinct factors
Dark circles is a reference to the purplish half moons that appear under certain individuals eyes. They make a person appear tired, older, or sick. They are primarily a hereditary trait but other factors can contribute as well, such as, fatigue, sun exposure, and nutrition.
distinct factors