However, one of the things that writers seem to miss, is the simple fact that most alien life is likely to inedible or toxic to earth life forms.
As biologist I know how many ways there are for terrestrial life to be nasty.. add in the fact that species from our evolutionary tree only use a small sub-set of the vast number of possible biological molecules, and it's not hard to imagine that alien life forms would be inedible, or induce violent allergic reactions, without adding in whatever toxins they've developed for defence.
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However, one of the things that writers seem to miss, is the simple fact that most alien life is likely to inedible or toxic to earth life forms.
As biologist I know how many ways there are for terrestrial life to be nasty.. add in the fact that species from our evolutionary tree only use a small sub-set of the vast number of possible biological molecules, and it's not hard to imagine that alien life forms would be inedible, or induce violent allergic reactions, without adding in whatever toxins they've developed for defence.
Much better to find a vacant planet and move in..