The general theory of evolution covers all living things, including both plants and animals. The theory is that all living things on Earth have a common ancestor, and over the course of billions of years, we have evolved and diversified into the various kingdoms, phyla, classes, orders, families and species that currently exist on Earth. Since evolution has no pre-determined goal or endpoint, it is reasonable to assume that evolution continues in the present day, and will continue into the future, for all living things.
Yes; in fact all life forms on Earth today evolved from algae like bacteria in the ocean long ago. Once atmospheric oxygen levels rose to a point that supported life plant life began to expand onto land. Single-celled organisms have inhabited this planet long before any organisms with legs or fins. Prokaryote is known to be the earliest and one of the least complex forms of life ever discovered in fossils. The earliest fossil dates back 3,500 million years, the oldest fossilized life form ever. Plants exist in all climates and thrive in most. Plant life is the most prevalent life form on Earth, taking the lion’s share of this world’s overall biomass. If we use prevalence and biodiversity as a measuring stick for evolutionary success, then plants are the evolutionary masters.
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