Omnivores and carnivores are related because omnivores also eat meat and carnivores eat strictly meat. For example, a t-rex is a carnivore and a omnivore is those rhino looking dinosaurs.
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The theory developed by Wegener that the continents of the Earth were once a part of a single big super-continent is based on his observations that these continents fir together as a part of the jig-saw puzzle. And these observed continents have similar flora and fauna along with similar rock formations. Such a derivation of theory from observations is an inductive reasoning.
Hence, the answer is 'inductive reasoning'.