Question

Which of the following features apply to both birds and dinosaurs?

O pygostyle
O furcula
O bipedal
O clawless fingers
O feathers
O keeled sternum (breastbone)
O complex respiratory system

Answer 1

Birds and dinosaurs share features such as a short tail, bipedalism, feathers, a keeled sternum, and a complex respiratory system.

Step-by-step explanation:

Both birds and dinosaurs share several features:

• Pygostyle: Birds and some dinosaurs have a pygostyle, which is the fusion of the caudal vertebrae resulting in a short tail.
• Bipedal: Birds and most dinosaurs are bipedal, meaning they walk on two legs.
• Feathers: Birds and some dinosaurs, like Archaeopteryx, have feathers modified for flight.
• Keeled Sternum: Both birds and some dinosaurs have a keeled sternum, or breastbone, which provides attachment for flight muscles.
• Complex Respiratory System: Birds and dinosaurs had a similar respiratory system with air sacs and lungs.