The first plants to develop a woody core and begin looking like tress were ferns - as early as the Middle Devonian (around 388 million years ago) one species, Wattieza, had already reached heights of 8 m and a tree-like habit. Archaeopteris (an ancestor to gymnosperms like conifers) came a bit later and produced the first true wood.
The first trees we would recognize where the Conifers which appear in the fossil record around the Pennsylvanian (323.2 million years ago to 298.9 million years ago) .
Really, Trees, both leafy and otherwise, reflect sunshine in very particular patterns, making it possible for satellites to map and computers to count strips of land where trees are. Biologists can then sample those places - forests, suburbs, city parks, even city streets - assume a tree density, multiply by acre or hectare, and calculate that. In 2005, there were 400,246,300,201 (more or less) trees on our globe. (That's over 400 billion, for those of you who have trouble working through the commas.) ***EDIT*** - Strange, 400 billion trees only averages out to 60 trees to every 1 human being? Most scientist agree that the data needed to complete the complex mathematics required to accurately approximate the number of trees on the planet Earth simply does not exist. The truth is, we have no idea. Estimates have ranged from anywhere between 1 to 10 trillion trees currently inhabit the surface of the Earth (a considerably noticeable gap can easily be observed between these two figures lol). The number you quoted above (400,246,300,201) was a study funded by an extremely liberal organization which went on to claim (outrageously) that over 50% of the trees on the planet Earth have been harvested/destroyed by human beings. If this were true, the entire human population would have been swept away in an enormous fresh water flood and any remaining survivors would eventually die from starvation, soil degradation/poisoning and/or extreme atmospheric deterioration. I'll let the rest of you decide what you CHOOSE to believe.
The earliest flora that we would recognize and call "trees" were early conifers that evolved during the Middle Permian epoch, about 275 million years ago. There were very large "tree-like" plants prior to that, but they were more akin to gigantic ferns.
400,243, 300, 201 (400 billon)
If you think that's alot, wrong!
25,000,000 trees are getting cut down
each year!! 3,400,000 (3.4 millon) trees
are planted in a year!! Each year huge
amount of trees are getting cut down.
Save the trees, save to environment,
About 360 million years. (After the Cambrian period 550 million years ago, or "Cambrian explosion", as it is known, when most animal life began on this planet, plant life began to appear. The first plants, in the ocean, appeared 460 million years ago, and the first trees about 100 million years after that.)
Answer 2 :
Trees must not be confused with plant ! Word trees is reserved for tree ferns , gymnosperms and angiosperms , which appeared in late Paleozoic Era nearly 400 million years ago .
It is estimated that flowering plants have existed on Earth as they do now for around 125 million years. With the Earth being 4.54 billion years old, that rounds up to about 6% of Earth's history.
The best guess is somewhere between 3.5 and 4 billion years, with the earliest clear fossil evidence being about 3.4 billion years old.
about 200 billion trees on earth
Yes they come from a planet were fried chicken grows on trees the rivers are grape soda and the planet is made of watermelon
Saturn is the second largest planet with many rings.
depends where planet X is
It is the hottest planet, and it is very rocky with many craters. It is terrestial and the closest to the sun and also the smallest planet.
Jupiter is the planet with the most moons. It has 63 confirmed moons.
Trees are the lungs of the planet.
the answer is no bacause no other planet has trees and trees help you breath
save trees save environment
Trees provide oxygen without trees this would be just a dead planet!
It suffocates trees and kills them.
No it does not can't support it
Trees help to keep our planet alive by converting carbon dioxide into oxygen which is necessary for humans and animals to live.
Yew trees are one of the longest living trees on the planet. We do not know how long they can live .
The approximate forested area of the Earth is estimated at 9.6 billion acres. One acre can hold, very roughly, 500 trees. So, we can estimate that the planet has 5 trillion trees.
Humans and pine trees both inhabit the planet Earth.