Question

In the evolution of vertebrates, the gnathostome step:

1. involved transition in the feeding method employed so the organism can select food from its environment
2. elastic fibers replacing collagen fibers provided support for raptorial feeding
3. complex, folded respiratory membranes for increased respiratory demands due to active lifestyle
4. ciliary pump supported by pharyngeal pump for a more forceful pull of water

Answer 1

Answer:

The evolution of jaws in gnathostomata provided wide array of feeding behavior to the organisms. Variousdifferent type of food uptake was possible due to this. So the correct option will be

(a)involved transition in the feeding method employed so the organism can select food from its environment.

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