Question

Today, it???s widely accepted that all of the two-legged meat-eating dinosaurs known as theropods??? including T. rex and Albertosaurus???had at least very simple fuzzy feathers covering their bodies. According to the tree you built, what distinguishes the feathers of modern birds and Archaeopteryx from the feathers of other theropods?

a. Barbs


b. Fibers


c. Filaments


d. Shafts

Answer 1

shaft

Explanation:

I took the test its not filaments that is wrong.

Answer 2

The answer is C filaments. Filaments of ealry theropods appear to be like down feathers and not originating from specific tracts. They had a short shaft with barbs, but no barbules. As you get evolutionary closer to modern birds (Archaeopteryx), the structure begins to look similar to modern birds but there is a major difference in the angles in which the barbs meet the shaft of the feathers.