Vascular plants are और suited to living on drier land than mosses and liverworts.
They have branching stems with tubelike walls that carry water and nutrients.
These stems and walls also mean the plants can stand tall. Vascular plants have spores (reproductive cells, like seeds)-the taller the plant, the और widely it can disperse its spores.
One of the first known vascular plants was Cooksonia. It was about 2 inches tall, with a forked stem.
Paleontologists discovered fossil remains of Cooksonia in England.
Rhynie in Scotland is one site where lots of vascular plant fossils have been found.
The plants at Rhynie would have grown on the sandy edges of pools in the early Devonian period. (400 mya)
One plant fossil found at Rhynie is Aglaophyton, which stood around 18 inches high.
Aglaophyton had underground roots and tissues that supported the plant stem. It also had water-carrying tubes and stomata that allowed air and water to pass through.
Land-living plants were essential for providing conditions for जानवर to make the transition from the seas to land. They created food, soil, and ground cover for shelter.
They have branching stems with tubelike walls that carry water and nutrients.
These stems and walls also mean the plants can stand tall. Vascular plants have spores (reproductive cells, like seeds)-the taller the plant, the और widely it can disperse its spores.
One of the first known vascular plants was Cooksonia. It was about 2 inches tall, with a forked stem.
Paleontologists discovered fossil remains of Cooksonia in England.
Rhynie in Scotland is one site where lots of vascular plant fossils have been found.
The plants at Rhynie would have grown on the sandy edges of pools in the early Devonian period. (400 mya)
One plant fossil found at Rhynie is Aglaophyton, which stood around 18 inches high.
Aglaophyton had underground roots and tissues that supported the plant stem. It also had water-carrying tubes and stomata that allowed air and water to pass through.
Land-living plants were essential for providing conditions for जानवर to make the transition from the seas to land. They created food, soil, and ground cover for shelter.
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 चोटी, शीर्ष 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 द्वारा loweringtheir heads and charging at their enemies.
At breeding time, the males may have engaged in head-butting contests, as some भेड़ 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 चोटी, शीर्ष 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 द्वारा loweringtheir heads and charging at their enemies.
At breeding time, the males may have engaged in head-butting contests, as some भेड़ and goats do today.
