If evolution is correct

The modern evolutionary theory believes that all existing organisms on the earth are those primitive beings that evolved over a long period, and in the process of evolution, due to the existence of genetic mutations, organisms will undergo some subtle changes from time to time in the process of reproduction from generation to generation. If some changes are conducive to better survival and reproduction, then these changes will pass the test of "natural selection" and be preserved and passed on from generation to generation, while the other way around, they will be eliminated by "natural selection".

Such a description will inevitably lead to a variety of doubts, for example, some people have raised the question: if evolution is correct, why do not plants evolve to be very difficult to eat? And some plants even produce sweet fruits?

Most of the plants that we think are delicious have undergone hundreds or even thousands of years of artificial selection, which simply means that during the process of reproduction of these plants from generation to generation, human beings will intentionally leave those plants that are relatively delicious and eliminate those that are relatively unpalatable, and only under human intervention will these plants evolve in the direction of "delicious". "tasty" direction.

The wild plants in nature, have been evolving in the direction of "unpalatable", a typical example is the most common plant in nature - grass.

The grass looks green and tender, its stems and leaves are covered with extremely coarse plant fibers, in addition, the grass will also absorb the silica in the soil, and will be built on the surface of its stems and leaves, in addition, many grass blades also exist in large quantities of hard keratinized barbs.

This structure not only makes the grass hard to eat, but also causes great wear and tear on the animal's teeth, even if it is swallowed by the animal, it is difficult to digest, so it can be seen that after a long time, the grass has evolved to be very hard to eat.

The evolutionary route of grasses has been somewhat successful, and fossil evidence shows that during the Eocene period, grasses used to proliferate on the surface of the Earth, and one important reason was that many phytophagous animals on the Earth at that time could not feed on grasses at all.

Yet we all know that on modern Earth, grass has become the main food of herbivores, so why can they eat it?

The reason is that they have evolved the ability to digest grass. For example, herbivores represented by horses have evolved high-crowned teeth that are very resistant to wear and tear and a well-developed intestinal system that allows them to chew the stems and leaves of grasses and digest them through a well-developed intestinal system, while herbivores represented by cattle have evolved a more powerful digestive ability than horses, although their teeth are not as resistant to wear and tear --Ruminate.

Cattle have four stomachs, three of which are "pneumogastric" evolved from their esophagus: the rumen, reticulum, and retruded stomach, of which rumen is the largest, and the other is the real stomach of cattle, the wrinkled stomach.

After some time, the grass swallowed by them will become soft and easy to chew, after which the grass will return to the cow's mouth through reverse vomiting.

After being chewed by the cattle, the grass is sent to the other two "false stomachs" for further processing to make it more digestible before it is sent to the cattle's wrinkled stomach and the intestinal system behind it, where it is digested and absorbed.

This is the case of grass, other plants on Earth are much the same, to avoid the gnawing of animals, they have evolved a variety of defense strategies, and for animals, food is an important guarantee of survival, so those animals that feed on plants must co-evolve with plants.

For example, cactus is a common plant in the desert, and camels want to survive in the desert, they have to evolve the ability to eat this spiky plant, which they do.

So the question is, from an evolutionary point of view, if plants have been evolving in the direction of "unpalatable", then why do some plants still produce sweet fruits? This is quite explainable.

These fruits contain plant seeds because these seeds are difficult to be digested by animals, so when animals eat the fruit, most of these seeds will be expelled intact by animals, if they happen to fall into a suitable environment for survival, they can be in a new area to branch out.

This is equivalent to the seeds of the plant with the help of animal mobility so that the plant population can spread at a faster rate, thus achieving the purpose of "better survival and reproduction". In other words, the purpose of these plants growing fruit is to attract animals to eat, which is a kind of plant-to-animal use, on the other hand, animals do not mind being used by plants, after all, there are sweet fruits that can eat.