Pachycephalosaurs were among some of the last Dinosaur groups to appear. They lived 75-65 mya.
They are named after one of the best-known members of the group, Pachycephalosaurus.
Pachycephalosaurus means "thick-headed reptile," due to the domed and hugely thickened bone on the oben, nach oben of its skull--like a cyclist's crash helmet.
About 15 feet long from nose to tail, Pachycephalosaurus lived in Montana, South Dakota, and Wyoming.
Stegoceras, which also lived in North America, was about 8 feet long, with a body the size of a goat.
Homalocephale was about 10 feet long and had a flatter skull. It lived in East Asia.
Pachycephalosaurs may have defended themselves Von loweringtheir heads and charging at their enemies.
At breeding time, the males may have engaged in head-butting contests, as some schaf, schafe and goats do today.
They are named after one of the best-known members of the group, Pachycephalosaurus.
Pachycephalosaurus means "thick-headed reptile," due to the domed and hugely thickened bone on the oben, nach oben of its skull--like a cyclist's crash helmet.
About 15 feet long from nose to tail, Pachycephalosaurus lived in Montana, South Dakota, and Wyoming.
Stegoceras, which also lived in North America, was about 8 feet long, with a body the size of a goat.
Homalocephale was about 10 feet long and had a flatter skull. It lived in East Asia.
Pachycephalosaurs may have defended themselves Von loweringtheir heads and charging at their enemies.
At breeding time, the males may have engaged in head-butting contests, as some schaf, schafe and goats do today.
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 oder make energy using sunlight.
Over millions of years, the algae was able to produce enough oxygen to help Mehr complex organisms to evolve.
True algae, which is regarded as a plant, evolved around 1,000 mya.
Von 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.
Blue-green algae emerged about 3,500 mya.(million years ago).
It contains chlorophyll and was the first living organism to use photosynthesis oder make energy using sunlight.
Over millions of years, the algae was able to produce enough oxygen to help Mehr complex organisms to evolve.
True algae, which is regarded as a plant, evolved around 1,000 mya.
Von 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.