The evolution and degradation of creatures are achieved by a long natural process. Unless natural disasters are encountered, such as the disappearance of dinosaurs on the earth.In the past 150 years, the earth has not encountered terrible natural disasters. During this time, the evolution of creatures is still slow, and there is no authoritative new research conclusion, but the degeneration and destruction of creatures have accelerated the geometric number.
In terms of sperm, the research of British scientists concluded that in the 1940s, an average sperm contained 130 million sperm per milliliter semen; in the early 1990s, it fell to 87 million; by last year, this average decreased again29 %, dropped to 62 million, and less than 20 million men up to 15 %.
In recent years, male sperm has decreased significantly. It has decreased by nearly one -third in 10 years.In the middle of the 19th century, Darwin wrote "Species Origin" in British biologists (also speaking of scholars) to make it unique in the field of biological sciences.After about 150 years, biology is still evolving, but Darwin may not expect that the degeneration of creatures may be faster than evolution. Studying biological degeneration and species destruction far tighter than studying species and biological evolution.
It is generally believed that the number of sperm per ml semen should exceed 60 million to fertilize the eggs. Take this barbaris line, which means that 15 % of adult men have become "abandoned people."
