The imperfection of measurement methods contributes to the common cause.
It is quite clear that in the cryptozoic, bacteria and viruses that enter the planet with space objects could, and most likely did, exist, at least in a passive form. This is one of the main ways of their settlement in the Universe. Well, the future will help us uncover this mystery.
Continuity of evolution
Everyone knows that evolution is continuous, but where are our ancestors. Well, to make it clearer, let us explain: unicellular organisms pass into multicellular organisms, but at this time new unicellular organisms should be formed from protein matter, which will move to a new level of development in parallel with the improvement of multicellular life. Thus, the chains of evolution must form, and we must witness the life of all transitional species.
Rudiments and atavisms are essentially just a violation of the genetic apparatus, and they cannot be perceived as a sign of origin from any species of animals. We have with the animal world many common elements of the genetic apparatus. Its failures will cause mutations, and will not return the traits of their predecessors to a person. There are objective reasons for each type of mutation.
If we pay attention to the beliefs of the tribes, then we can understand where Darwin got his ideas about human development. The inhabitants of ancient India and the Malay tribes believed that people descended from monkeys, the inhabitants of the island of Borneo believed that orangutans were people who stopped working. If not for genetics, then these views would take root in us for a long time.
All of these beliefs are vestiges of totemism, and most of the various tribes believed in their descent from various species of mammals, reptiles, birds, amphibians and rodents.
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All biological creatures develop according to the same laws, and on land they acquire one form, in water or air - others, often changing their habitat. The forms of creatures are similar (theory of forms), each creature, depending on the conditions of development, consists of a certain set of common features (forms) that are permissible and close to ideal.
Collective labor smoothly changes the characteristics of all creatures, and it is simply impossible to explain the leap in human development to them.
With its nine-month development, the human embryo, after a month and a half, acquires features similar to those of primates, and then overcomes this milestone. Having observed the intrauterine development of living beings, we can understand the order and stages of their development.
Darwin, creating his theory, drew attention to the external similarity of man and ape and considered man to be a modified version of primates. But the apparent jump in parallel development was inexplicable.
Then, to save the day, Darwinists introduced the idea of a common ancestor, although they did not see the appearance of the ancestors of apes and humans.
The common ancestor is no longer the monkey that Darwin drew on the similarity with man, just as man, according to the theory of evolution, was previously Neanderthal, Pithecanthropus, but not man.
It seemed that the theory of human evolution could fail, but enterprising people put him in the same chain with monkeys, calling "intelligent man" the creature that should be the modern fruit of the evolution of ancient primates.
The main thing here was the presence of the word "man" in the name of the creature, because how else could a descendant of primates be associated with modern man? But this descendant is modern monkeys, but not a man, and you can't get off with just one name!
Now it was necessary to explain the existence of modern primates. There are many types of monkeys, but it would be wrong to attribute humans to them. Then the followers of Darwin's theory deleted monkeys from a single chain of development, defining creatures as secondary to humans.
But after all, it was with them that Darwin compared man; it was from them, according to his first impression, that man came. It remained unquestionable that Darwin had discovered something grandiose, but his mistake in human development could have influenced the skepticism of scientists on his entire theory.
Although the fallacy of the fact does not prove the fallacy of the theory, this is the nature of man. And it was necessary to iron out the shortcomings.