Mammals, like other creatures, ____ to their environment or perish. a) must either adapt b) can either adapted c) might either adapt d) have to either adapted
a
Adaptation ____ when an animal with traits suited to survival produces offspring. a) occurs b) occured c) will occur d) has occurred
a
Conversely, an organism with disadvantageous or harmful traits _____ fewer or no offspring. a) had b) have c) will have d) will have had
c
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