In the Carboniferous Period of 360 to 286 million years ago, large, swampy jungles spread lungs across much of the earth. The planet's average temperature was much higher than it is today and the air was humid, making conditions perfect for plants to thrive.

Plants such as the giant club moss and best quotes) horsetail fern grew increasingly large. They developed thicker trunks and reached heights of 70 and 80 feet. Also, the first trees, known as gymnosperms, began to appear. Gymnosperms are trees like the pine and the ginkgo, which have protected seeds.

In the Carboniferous Period of 360 to 286 million years ago, large, swampy jungles spread across much of the earth. The planet's average temperature was much higher than it is today and the air was humid, making conditions perfect for plants to thrive.

Plants such as the giant club moss and horsetail fern grew increasingly large. They developed thicker trunks and reached heights of 70 and 80 feet. Also, the first trees, known as gymnosperms, began to appear. Gymnosperms are trees like the pine and the ginkgo, which have protected seeds.