species or variety
population
they can produce fertile offspring
They produce offspring so that organisms species doesn't become extinct!
If two organisms are able to mate and produce fertile offspring, then they are of the same species.Horses and donkeys are two different species because if they mate, they produce a mule which is sterile (not fertile). This shows horses and donkeys are of different species.
this is the vital power of all sexually reproducing living beings, that if there is mating btwn natural parteners, then they will produce, offspring which bears natural capability to produce its next generation. .
asexual reproduction
No, only organism in the same species can produce fertile offspring. Organisms from the same class sometimes can reproduce, but they cannot produce fertile offspring.
Organisms of the same species that can successfully mate and produce fertile offspring are considered to be interfertile. This means that they are genetically compatible and able to produce offspring that are also fertile. Examples include humans, dogs, and horses.
species
Then they are the same species.
species
mammals
Organisms that belong to the same species can reproduce a fertile offspring.
A species is a group of similar organisms that can mate and produce fertile offspring.
population
population
a species.