Which example of similar structures indicates that the species are related? A. Fins of sharks and penguins
B. Forelimbs of bats and dogs
C. Wings of birds and insects
D. Webbed feet of frogs and ducks

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic