One Answer

  1. Down syndrome is a disease, not a separate species, for the following reasons::

    1) There is no reproductive isolation. These patients can have fertile children naturally from healthy partners. Representatives of a particular biological species can only reproduce within their own species.

    2) The geographical criterion is not suitable. That is, downs are born everywhere. A separate species forms its own range.

    3) The environmental criterion is not suitable. There are no specific abiotic and biological conditions for the birth of sick people.

    4) The morphological criterion doesn't work. There are no sufficient internal and external signs that distinguish downers from healthy people.

    5) The physiological and biochemical criterion does not work. There are no sufficient differences between the physiological and biochemical properties of downs and healthy people.

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