<span>A: The proportions of a population that are at different age levels make up the population’s age structure. </span>
Pretty sure it's D, hope I helped
<h3>Hurry please help How does filtration occur during the formation of urine?</h3>
Answer : A.) Pressure causes water and dissolved substances to filter through capillary walls of the glomerulus.
Hope this helps!
Answer:
"Examine the list of all known species of birds and determine if any species cannot fly" would be the most reasonable answer.