For the same reason that dogs are one species but many different colors.
There is only one species of domestic ferrets, they come in different colors and variations
Citrus x paradisi. All grapefruit are one species; the various colors come from the different cultivars.
No, there were many different prehuman species both at different times and living at the same time. Even as late as the last ice ages there were two different species of what could be called "modern humans" living at the same time: Homo Sapiens Neanderthalis and Homo Sapiens Sapiens. Finally the Homo Sapiens Neanderthalis went extinct, leaving only our species Homo Sapiens Sapiens.
One squirrel can generally only be one color. However, there are different colors of squirrels throughout the species (brown and gray the most common, followed by a rarer red).Read more: How_many_different_colours_can_squirrels_be
It is believed to be the Avifauna of India which includes about 1301 species, of which 42 are endemic. It is stated that one has been introduced by humans, and 26 are rare or accidental. It is about 1300 different species.
No one knows what humans will look when they become a new species. It will depend on the type of species that humans evolve into that will determine what they look like.
well for one, they are different species and so will have their bodies build up in a different way to our own. The potential for organ failure or rejection will be much higher that same species transplant. I know that certain pieces of organs can be used in humans but most organs differ from species to species to be incompatible as a subtitute. Bovine heart valves are compatible to humans to allow transplant of the valve, but not the entire heart.
Neanderthals and humans are genetically similar. Less than one percent difference in their DNA.
There is only one species of human, Homo sapiens. Those species more closely related to humans and who may have potentially been assimilated by Homo sapiens are below:Homo gautengensisHomo habilisHomo erectusHomo antecessorHomo ergasterHomo rhodesiensisHomo heidelbergensisHomo neanderthalensisHomo floresiensis
There is not 13 different species of finches, there are one species. There are variations, but still one species. There are 250 different breeds of dogs, but still dog species
rhinoceros
Humans.