...offspring but who cannot produce viable, fertile...
...or different years cannot mix gametes. The...
...in opposite spirals cannot mate with each...
...and the hybrid cannot backbreed with either...
...robust organism, it cannot mate (except very...
...For example, one cannot test the reproductive...
...tetraploids. The tetraploid cannot mate with diploids...
...each other but cannot breed with either...
...geologic terms) often cannot be distinguished in...
...gradual change, we cannot tell when a...
...directions, snails’ genitalia cannot meet and snails...
...meet and snails cannot mate. Douglas Schemske...

...and (d). You cannot add or subtract...
...dimensionally correct, it cannot be correct. 1...
...a dimensionless constant, cannot be obtained by...
...the room that cannot be covered by...