The first single celled life form appeared on earth roughly about 3.5 billion years ago
I believe it's "C. When glucose levels are low and lactose is present" I may be wrong.
Answer:
It isn't a mammal.
Explanation:
The king snake is not a mammal.
Pulmonary artery carry deoxygenated blood while are there arteries carry oxygenated blood.
pulmonary vein carries oxygenated blood while the other veins carry deoxygenated blood
