Answer:
The counter-current multiplier or the countercurrent mechanism is used to concentrate urine in the kidneys by the nephrons of the human excretory system. The nephrons involved in the formation of concentrated urine extend all the way from the cortex of the kidney to the medulla and are accompanied by vasa recta.
It creates more space for farming
Darwin believed in Darwinism which is a theory of biological evolution stating that all species of organisms arise through a process called natural selection to compete, survive, and reproduce
Allosterically is your answer
