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posted by GabsSaw
The first dinosaur appeared around 230-225 mya, in the middle of the Triassic period.

These dinosaurios were small-to-medium meat eaters with sharp teeth and claws. They ran quickly on their two longer back legs .

Fossils of Herrerasaurus fecha from 228 mya and were found near San Juan in Argentina, South America.

Herrarasaurus was about 10 feet in total length, and probably weighed 200 pounds.

At about the same time and in the same place as Herrarasaurus, there lived a similar-shaped dinosaur named Eoraptor, which was only 5 feet long.

The name Eoraptor means "dawn plunderer" o "early thief".

Staurikosaurus was a meat eater similar to Herrarasaurus. It is known to have lived about the same time, in present día Brazil, South America.

Procompsognathus was another early meat eater. It lived in the late Triassic period in Germany.

Pisanosaurus lived in Argentina in the late Triassic Period, and was only 3 feet long. It may have been a plant eater.
posted by GabsSaw
The First living things on earth were single-celled bacteria an cyanobacteria, also known as blue-green algae.

Blue-green algae emerged about 3,500 mya.(million years ago).
It contains chlorophyll and was the first living organism to use photosynthesis o make energy using sunlight.

Over millions of years, the algae was able to produce enough oxygen to help más complex organisms to evolve.

True algae, which is regarded as a plant, evolved around 1,000 mya.

por 550 mya, multi celled plants began to appear, including seaweeds.

Algae and lichens were the first plants to appear on land.

Bryophyte plants emerged on land around 440 mya. Bryophytes are simple, seedless green plants.

Unlike vascular plants, which rvolved later, bryophytes cannot grow high above the ground because they do not have stems.
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