Which of the following feather types to reduce drag produced by wind resistance during flight?
flight feathers
primary feathers
secondary feathers
contour feathers

Contour feathers

Explanation:

Contour feathers are those typical feathers that line the body of the animal and aid in flight. They help reduce drag caused by wind resistance during flight and have a long rake and vane that form a firm blade on the distal portions and have a feathery texture on the proximal portion. The so-called feathered and receding feathers, known as flight feathers, are types of contour feathers found on the wings and tail, respectively.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.