The Earth is about 4.5 billion years old. The start of any type of life form is, naturally, a topic of much debate. Some scientists estimate that ‘life’ began on our planet as early as four billion years ago. And the first living things were simple, single-celled, micro-organisms called prokaryotes. There are still lots of prokaryotes around today, bacteria are just one example of these types of cells.

What was the first living animal on earth?

Earth’s first animal was the ocean-drifting comb jelly, not the easy sponge, in keeping with a brand new find that has shocked scientists who didn’t imagine the earliest critter can be so complex. The mystery of the primary animal denizen of the earth can only be inferred from fossils and by studying related animals today. to urge to the underside of that, scientists analyzed massive volumes of genetic data to define the earliest splits at the bottom of the animal tree of life. The tree of life may be a hierarchy of evolutionary relationships among species that shows which groups split off on their own evolutionary path first.

How many animal species are there?

About 8.7 million is that the new, estimated total number of species on Earth. the foremost precise calculation ever offered with 6.5 million species on land and a couple of.2 million in oceans. Announced by the Census of Marine Life, the figure relies on an investigative analytical technique. the quantity of species on Earth had been estimated previously at 3 million to 100 million.

10 oldest species in the world

  • Horsetails
  • Coelacanth
  • Elephant Shark
  • Horseshoe Crab
  • Nautilus
  • Velvet Worms
  • Jellyfish
  • Sponges
  • Ctenophores (Comb Jellies)
  • Cyanobacteria

Are dinosaurs real,

Dinosaurs are a bunch of reptiles that have lived on Earth for about 245 million years. Dinosaur fossils are found on all seven continents. All non-avian dinosaurs went extinct about 66 million years ago.

There are roughly 700 known species of extinct dinosaurs. Modern birds are a sort of dinosaur because they share a typical ancestor with non-avian dinosaurs.
Paleontologists are like detectives who examine the evidence that extinct animals left behind. Those clues to what dinosaurs were like are found in fossils—the ancient remains of an organism, like teeth, bone, or shell—or evidence of animal activity, like footprints and trackways.

The earliest known dinosaurs appeared during the geological period. Dinosaurs evolved into a diverse group of animals with an enormous array of physical features, including modern birds. From a personal footprint, scientists can estimate the peak of the dinosaur that made it. A rough estimate of leg length is obtained by multiplying the print length by four.

Modern birds, or avian dinosaurs, have skeletal features that are almost a twin of some non-avian dinosaurs. Feathers evolved before flight and should have functioned as insulation to stay dinosaurs warm, or for display as some way to draw in mates.

Animals That No Longer Exist Because Of Humans

Humans also cause other species to become extinct by hunting, overharvesting, introducing invasive species to the wild, polluting, and changing wetlands and forests to croplands and concrete areas. Even the ascension of the human population is causing extinction by ruining natural habitats.
Among the foremost famous species driven to extinction by humans is that the dodo, a bird that primarily lived within the island nation of Mauritius. Dodos were first mentioned by Dutch sailors within the late 16th century and last seen in 1662 after having been hunted to extinction.

  • The dodo (Raphus cucullatus)
  • West African Black Rhinos (Diceros bicornis longipes)
  • Quagga (Equus quagga quagga)
  • Tasmanian Tiger (Thylacinus cynocephalus)
  • Zanzibar Leopard (Panthera pardus adersi)
  • Passenger Pigeon (Ectopistes migratorius)
  • American East Coast Puma (Puma concolor couguar)
  • Yellow fatu (Abutilon pitcairnense)
  • Kalimantan mango (Mangifera casturi)

Animals that only exist in one place

“Endemic” refers to a species that’s uniquely found in one a part of the globe, which part only! These styles of animals are most typically found in additional isolated parts of the world, like islands, but they will be found in other places too.
Endemic species are geographically constrained to 1 place on the world. They often form in biologically isolated areas like islands and huge bodies of water, though humanity has pushed some continent-based animals to a scourge state through hunting and habitat loss. Unfortunately, because of their geographic isolation, endemic species run the next risk of extinction.

  • Matschie’s Tree Kangaroo Where: Papua New Guinea

  • Kiwi Where: New Zealand

  • Giant Panda   Where: China

  • Norway Lemming  Where: Norway

  • Scottish Wildcat   Where: Scotland

  • American Alligator    Where: Florida, USA

  • Poison Dart Frog Where: Costa Rica


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