Trees are an indispensable part of the earth. The trees are like the lungs of the earth, and more than 60%of the oxygen in the air comes from trees and green plants on the land.

They absorb carbon dioxide gas, release oxygen, and form an atmosphere on the surface of the earth to protect the earth.

For humans, a person who lives to be more than 100 years old is considered extremely long-lived. The large trees that have been found so far first appeared in the late Middle Devonian Century.

It's a very big tree, it can grow up to more than five meters tall. And these trees can live for a long time, often for hundreds of thousands of years.

But not all trees can grow so tall. The height and shape of the trees are also determined by genes like humans. Affected by the gravity of the earth, trees cannot grow infinitely.

In addition, from the perspective of photosynthesis, the concentration of carbon dioxide is also an important reason that affects the length of the trees.

Studies have shown that the growth of trees is also related to the thin tube in the leaves and trunks. The trees absorb moisture through the thin tube in the leaves.

The finer the tube, the higher the height of the water can be achieved, and the higher the tree has the potential to grow.

The leaves of most trees will have a new and old process every year, especially in areas with clear climates. In autumn, leaves will be seen. By the time of the spring of the next year, the trees will grow new leaf buds.

Each leaf will have its own unique lines. These patterns are the veins with different thicknesses on the leaves and are called leaf veins.

The veins are regularly distributed in the leaves and are connected to the vascular tissue in the stem through the petiole. On the one hand, it provides water and inorganic salts and outputs photosynthetic products on the one hand; on the other hand, it supports the leaf tablets so that it can stretch the space and ensure that the physiological function of the leaves goes smoothly.

During the growth process, the leaves will absorb light into energy and perform photosynthesis. If the sunlight is too strong, the leaves will gradually yellow until it withers.

Therefore, the growth of the leaves is also changed according to the degree of strength of the sun. Trees can also slowly explore a balance point in a unique biological environment and grow quickly.

In addition to providing humans with oxygen, trees will also perform steaming effects and humidify the air. At the same time, the roots of the trees can also have a good windproof effect.

The trees will gather the scattered sand together without letting them flutter with the wind. Planting a large number of trees around the city to form a protective forest can also prevent sand from blowing toward the city.

When many cities are in construction, some trees will also be planted on both sides of the road as a greening to the city. After processing the wood, it can also be made into crafts or architectural products. Some trees even have medicinal value, and the trees after processing can help people relieve pain.