Biological diversity, or biodiversity, is the variety of life either in a particular place or on the entire planet Earth, including its ecosystems, species, populations, and genes. They live on land, in the ocean and in lakes and rivers. An unprecedented DNA study has found evidence of a single human migration out of Africa and confirmed that Aboriginal Australians are the worldâs oldest civilization. Turtles, tortoises and terrapins are reptiles with protective shells. Scientists found a 34-year-old grizzly bear in southwest Wyoming, identifying him by a mark on his lip made by biologists in 1989. Redwood trees, in particular giant sequoias, are some of the oldest and largest trees in the world.Many specimens have a verified age over 2,000 years and some of the oldest-known redwoods are over 3,000 years old. The oldest known hominid, or humanlike species, has been dated at 4.4 million years old. Trees are earth's largest organisms and are also one of the planet's oldest inhabitants. Thatâs the oldest grizzly ever known in the Yellowstone region that includes parts of Montana, Idaho, and Wyoming. But the rate of ⦠Seasonal forests (unlike tropical rain-forest) the largest land habitats. Another species, which is yet to be confirmed as a hominid, has been dated at 6 million years old. New species and organisms flourished under the oceans then making their way onto the land. As new species evolve to fit ever changing ecological niches, older species fade away. Founded in 1985, The Conservation Fund is a non-profit organization with one simple, albeit expansive, task: protecting more than seven million acres of land in the United States, including parks, forests, deserts, waterways, and more. The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga.: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, soon after the formation of the Earth's crust and the Earth ⦠Brazil's many native trees include jabuticaba, whose fruits grow directly on its trunk. Adriano Makoto Suzuki / Flickr / CC BY 2.0 A third of all trees grow in the endless taiga of the Arctic north. There are more than 300 species. The massive step in evolutionary terms began the process for plants and trees to develop. Earth has more than 60,000 known tree species. Earth is the third planet from the Sun and the only astronomical object known to harbor life.About 29% of Earth's surface is land consisting of continents and islands.The remaining 71% is covered with water, mostly by oceans but also by lakes, rivers, and other fresh water, which together constitute the hydrosphere.Much of Earth's polar regions are covered in ice. In 2005, the group launched Go Zero, an initiative dedicated to offsetting climate change by planting trees.Ever since, they've planted more than 10 ⦠The oldest fossilized tree remains date to 385 million years ago. Conservation, study of the loss of Earthâs biological diversity and the ways this loss can be prevented. Around 500 million years ago that the first organisms set foot upon the earthâs surface. Northern America has forests that include California's sequoia's, the earth's largest trees. More than 99 percent of all organisms that have ever lived on Earth are extinct.