Question

birds and dinosaurs
though we think of dinosaurs as being extinct, recent research suggests that their modern relatives live among us in the form of birds. like birds, many dinosaurs built nests, laid eggs, and had feathers. over the last twenty years, scientists have collected more and more evidence suggesting that dinosaurs evolved into birds. for example, thousands of fossils of dinosaurs with feathers have been found in china, and fossilized dinosaur eggs are similar in size and shape to birds eggs. fossils have also revealed information about dinosaurs skeletons. birds have hollow bones to enable flight, and so did some dinosaurs. in addition, birds and dinosaurs exhibit many similarities in their legs, feet, and claws.
what is the main, or central, idea of the passage?
fossil evidence shows that the legs, feet, and claws of dinosaurs and birds are similar.
fossil evidence shows that dinosaurs and birds share many features, suggesting that they are related.
fossil evidence shows that some dinosaurs had hollow bones, which probably enabled them to fly.

Explanation:

The passage discusses how recent research and fossil evidence (like feathered dinosaur fossils, similar eggs, hollow bones, and similar limbs) show many shared features between dinosaurs and birds, suggesting a relationship (dinosaurs evolving into birds). The first option only focuses on limbs, feet, and claws (a small part). The third option focuses on hollow bones (also a small part). The second option captures the broader idea of shared features and their relation.

Answer:

B. Fossil evidence shows that dinosaurs and birds share many features, suggesting that they are related.