In the United States, before taking off from the gulf coast, most migratory birds will type your answer...
their body weight by stocking up on fat reserves before crossing the Gulf of Mexico.

its d lol

; 0

i think its y= -4x-14

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.