Over 200 plant species grow in vernal pools and the surrounding prairie. Half of these are rarely found outside this unique habitat. A single pool typically supports only 15 to 20 species in an unpredictable array of combinations. In that way, vernal pools are a lot like snowflakes – botanically speaking, no two are alike.
For 2 billion years, bacteria were the only creatures on Earth. Long before the dinosaurs, a special type of bacteria slowly increased the level of oxygen in the Earth’s air to 20 percent. Without this oxygen other plants and animals could not have evolved, including us.