In fact, before the creatures came to the land, the boundary between animals and plants was not very strict, the original sense of the plant is actually the kind of organisms that absorb substances and permanently turn them into their own bodies, and animals are organisms with a simple digestive system, which can excrete the useless substances they ingest into their bodies, they all live in the ocean and naturally adapt to the environment in the sea, and the ocean becomes land to accelerate the differentiation of the two organisms, and the plants as mentioned above, with the help of nutrients absorbed from the earth and light confrontation, In addition, the undead cells absorb the cells that have been burned by the light and successfully evolve chloroplasts, a nutrient unique to plants, and then reproduce on land, as do animals. Pen Fun Pavilion wWw. ｂiquge。 ｉｎfo

Some people think that it is the chlorophyll of plants that enriches oxygen so that animals have the ability to survive on land, but this is not the case, organisms with a digestive system and organisms without a digestive system have cells that are unique to life organisms that can continue to divide, and this kind of cells will absorb the substances they are in contact with in the process of continuous division, regardless of whether plants have the function of releasing nutrients in the air to weaken the damage of ultraviolet rays to cells, organisms that have landed on land will absorb substances in the air as energy for their own survival, the reason is very simple, if they cannot absorb them, they will dieAs a result, the animal with a digestive system is constantly dividing after absorbing the energy provided by plants or animals, and is constantly exposed to these substances that are extremely harmful to him. Like plants, in order to adapt to the terrestrial environment more quickly, animals become smaller in size in order to change their body structure to adapt to the environment, and once the body adapts to the environment, they will replicate life in large numbers and quickly become larger. This process is very slow, just like the organisms in the ocean to evolve the body shape to adapt to the marine environment, it takes a very long time, they try to contact a small scale of strange substances, and then transform them into a part of the body, now we humans say that the trace elements necessary for life, at that time for those primitive life was closer to life killers, they came into contact with these substances to make these substances a part of their body, at the beginning of their body size was very small, the result of ingesting too many elements was the collapse of their structure, the disappearance of vital characteristics, and became the nourishment for the evolution of other lives。

In the process of cells engulfing each other, the originally huge amount of substances occupies only a small part of the body, that is, the trace elements necessary for life. Animals finally gained a foothold on land, but then another big problem appeared in the body of this small creature, in order to preserve water, the exoskeleton evolved by organisms has become the weakness of these creatures, they must grow up to remove this layer of hard shell, and after the removal of this layer of shell, their ability to protect themselves and act will be weakened, although it will not be too long, but this is enough for their natural enemies to kill them, so there are some reverse evolutions, the hard limb shell of the exoskeleton is the guarantee of mobility, and the importance of action for a creature is stronger than defenseSo what they can do is to strengthen the existing exoskeleton in development, like locusts, dragonflies and other creatures, they can already evolve in a short time or even for a long time.

The evolution of animals is very synchronous, vertebrates and invertebrates are also synchronous evolution, invertebrates have evolved advanced life-saving tools such as jumping legs and membranous wings, and vertebrates have naturally undergone some evolution. The primitive amphibians are just fish with longer fins, and the more advanced amphibians are frogs, and the ability to jump allows them to add great security to life in many cases. Reptiles move from crawling close to the ground to running on the ground, and their speed is their greatest advantage, while their disadvantage is the protection and identification of their offspring. If the population wants to expand, it must stop fighting each other, so reptiles began to have nest protection behaviors, and more advanced reptiles are more careful care of their children, helping young children to obtain food, and then producing these behaviors of breastfeeding, and gradually evolved into mammals, with a relatively constant temperature to maintain the activity of the body, hunting and collecting food.

It is the instinct of living beings to use reaction force to move, and the sailfish in the water that can fly eagles for a short time on the surface, the tree frogs that can glide on the amphibians, the pterosaurs in reptiles, the bats in mammals, birds, locusts in insects, and dragonflies all move with the help of reaction forces. Liquids and gases are different in our consciousness, but for living beings, solids, liquids, and gases are substances that can provide us with power or assist in movement.