Inside our body, millions of nephrons in the kidney filter wastes in 2 steps. Each nephron has a glomerulus and a tubule. Waste filtering undergoes 2 steps:
First, fluid and waste pass through the glomerulus but, proteins, blood cells, and other large molecules are prevented from passing through. Second, the filtered fluid passes through the tubule wherein the filtered wastes are removed; minerals are sent back to the body, and the remaining output becomes urine.
External Respiration takes place in the Trachea. When oxygen and co2 "switch" its where they connect and making this external respiration!
I hope this helps you!
The Collective Set of Alleles in a Population Is Its Gene Pool. The fact that genes exist in alternate forms, called alleles, forms the basis for the study of population genetics.
(I believe this is the correct answer)
A. Proteins
Most scientists thought protein was the genetic material because they were macromolecules.