rick wrote:

<snip>

>>You can identify some differences which hold between most
>>humans and
>>most nonhumans and claim that they are morally relevant, but
>>there will
>>always be some humans who don't have these differences from
>>nonhuman
>>animals.

> =====================
> But the main difference still remains. Within each person is the
> seed of what being human is.

Which is what? How are you defining "human"? And, as
important, why is it morally relevant?

> No such seed exists in ANY animal.

Depends on what your definition is.

> The person you claim now
> doesn't have the differences from animals has the potential to
> achieve those differences.

That is not true for all biological members of the human species.
Pick any characteristic which is morally relevant, and you will
find at least some biological humans who lack it from birth and/or
are completely incapable of developing it. Speciesism is simply
a prejudice, like racism or sexism.

<snip>