The anther contains the pollen . The flowers are used in reproduction. They evolved during the Cretaceous period . An apomorphy is a new genetic characteristic common to a clade . Feathers are an apomorphy for birds.
Many plants are aquatic, including seaweeds .
Many animals are arboreal, including the sugar glider. An arid area is dry and hot, with little rainfall and few plants. An asteroid is a large rock or small planet orbiting the Sun. Most asteroids lie in a belt between Mars and Jupiter . An asteroid impact with the Earth may have caused the K-T mass extinction.