Scientists date the earliest life on the planet to 3.5 billion years ago as a bacterium.
Here's the explanation:
1. Earliest life: Scientists have conducted extensive research and analysis of fossil records, geological formations, and genetic evidence to determine the origin of life on Earth. Through these studies, they have identified evidence of microbial life dating back approximately 3.5 billion years.
2. Bacterium: The earliest life forms on Earth were simple, single-celled organisms known as bacteria. These microorganisms are prokaryotic, lacking a nucleus and other membrane-bound organelles. Bacteria are incredibly diverse and can be found in various habitats, including soil, water, and even extreme environments like hot springs and deep-sea vents.
3. Evolutionary history: Bacteria played a crucial role in shaping the early Earth and paving the way for the evolution of more complex organisms. They were instrumental in the development of oxygen-producing photosynthesis, which eventually led to the diversification of life forms on our planet.
While other forms of life, such as animals, fungi, plants, and protists, have evolved over time, the earliest life on Earth can be traced back to simple bacteria. These microorganisms were the pioneers of life, establishing the foundation for the incredible biodiversity that exists today.