Some 65 million years ago, just after the demise of the dinosaurs, a small rat like species of mammal now known as a prosimian left the ground and took to life in the trees. Eventually after 50 million years had passed, this creature returned to the ground as the ancestor of man. The period spent in the environment of the trees was of great formative importance because it promoted many physical changes. These changes included a massive increase in body size, the development of paws into hands and 3d colour vision. The physical changes were mapped by an increase in the size and the capability of the brain. The increase in stature led to changes in posture which enabled some simians to stand upright. It was these changes which led to the descent from the trees and eventually to homo sapiens.

National Technical Honor Society Essay

So it can be seen that without trees the evolution of prosimian into man would never have taken place.

the development of human civilization

the development of civilization has been dependent on wood based technologies. Where would we be without such aspects of our culture as fire, agriculture, the wheel, the use of metals, spinning, weaving, water and land based transport, building, and printing? our technological culture could not have developed without wood. The tree is the embodiment of mankind's condition: birth, life, death, regeneration and rebirth. The rising sap is the spirit of life and seeds and fruit are the symbols of fertility.

To grow tall the tree has become a miracle of engineering and a complex chemical factory. It is able to take water and salts out of the earth and lift them up to the leaves, sometimes over 400 ft above. By means of photosynthesis the leaves combine the water and salts with carbon dioxide from the air to produce the nutrients which feed the tree.

In this process, as well as wood, trees create many chemicals, seeds and fruit of great utility to man. Tropical rain forests have of particular significance although they now occupy less than 6 per cent of the land surface of the earth they probable sustain more than half of the biological species on the planet. Notwithstanding the debt we owe to trees, their emotive power, and their importance to other forms of life, the forested area of the earth is steadily being depleted. This is leading to the degradation of the environment and the extinction of many species. There is now a real danger that in the not very distant future man will destroy a large proportion of the present population of species on earth, create an uninhabitable environment, and then die out himself. If this happens it will not be the first time that a large proportion of the species on the earth have been extinguished.

Mode of operation of the gt/teg are: initial cost of investment $16936101.2 operation and maintenance cost $492187.5 salvage value $1307467.01 life of equipment 20years minimum attractive rate of return marr 8.75 % fig. Mode of operation of the gt/teg are: initial cost of investment $16936101.2 operation and maintenance cost $492187.5 salvage value $1307467.01. задавая общие вопросы, старается отгадать, какое животное было задумано. вот примерные вопросы: does it live in people's houses on a farm, in the forest. In the jungle, in water ? is it a wild animal or a domestic one? is it large small ? does it eat meat grass, corn, fish, fruit or vegetables ? has. Steve nix is a professional forester and natural resource consultant who also writes, blogs and maintains a forestry/forest/tree information web site for about.com. Read more the trees around us are extremely important and have always been necessary for improving the human condition both during its life and after harvest.

It is not a stretch to believe that without trees we humans would not exist on this beautiful planet. In fact, some claim can be made that our mother 39 s and father 39 s ancestors climbed trees another debate for another site. So, trees are essential to life as we know it and are the ground troops making up an environmental frontline. Our existing forests and the trees we plant work in tandem to make a better world. But i dare say that trees are necessary to harvest in a practically planned and sustainable way using the multiple use concept. At the very beginning of our human experience, trees were considered sacred and honorable: oaks were worshiped by the european druids, redwoods a part of american indian ritual, baobabs a part of african tribal life, to the chinese the ginkgo link and monkey puzzles to the chilean pehuenche. The modern human community has other, more practical reasons to admire and honor trees.