18. Which idea was central to Darwin's theory but not to earlier evolutionary thinkers? (A) Species change through time (B) Organisms show variation (C) Inheritance of acquired characteristics (D) Natural selection as a mechanism of adaptation

1. Which definition best captures the scope of ecology? (A) The study of organismal physiology and behavior (B) The study of genetic variation in populations (C) The study of species diversities and distributions across continents at different temporal and spatial scales (D) The study of interactions among organisms and between organisms and their environment

18. Which idea was central to Darwin's theory but not to earlier evolutionary thinkers?
(A) Species change through time
(B) Organisms show variation
(C) Inheritance of acquired characteristics
(D) Natural selection as a mechanism of adaptation

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