Answer:
population size, population density, when scientists population spacing and age structure
Explanation:
because because four characteristics is defined a population and i kind of just know.
Answer: The Pulmonary Arteries
Explanation: They are two pulmonary arteries with on serving each human lungs, which brings deoxygenated blood to the lungs from the hilium. The arteries go into the capillaries of the alveoli. Capillaries are the thinnest ,smallest blood vessel,they supply oxygen to single tissues in all parts of the human body.
It contracts and is pulled downwards
English because of the laugueg
