Other examples of adaptations are listed in the chart below. They come in every conceivable variety. According to geologic history, earth's earliest plants consisted of tiny plants floated on the water. These early plants had no roots, leaves, or flowers. They reproduced by dropping spores on the ground which grew into new plants.
Geologic evidence shows plants next developed leaves and roots.
Plants began using photosynthesis to supply their food, but still reproduced by dropping spores onto the ground that grew into new plants. Some of these early plants were known to be giant ferns. There are giant ferns that grow as tall as fifty feet still living today in tropical climates. Following the ferns, fossil evidence shows that conifers were the next plants to grow and develop. The largest cones are female cones, and the smallest cones are male cones.