Over time, some plants growing in an area are crowded out by other plants. the new plants use up water and nutrients needed by the previous plants. the disappearance of the first plants is due to

just go with your heart buddy

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.