It's some change in the conditions around the organism, which the organism can detect and respond to. A change in temperature, more light, or something physically poking the organism are examples.
Pulmonary artery carry deoxygenated blood while are there arteries carry oxygenated blood.
pulmonary vein carries oxygenated blood while the other veins carry deoxygenated blood
I is answer. Don't open link. It is most likeky unsafe.
Answer:
Your answer is photosynthesis.
Answer:
D. autrofos es tu respuesta