Fossil plants showcase
The earliest life on Earth is very little known. It has not left any fossils. It was microscopic organisms (cyanobacteria) that lived in water, and which built organic compounds from inorganic, - that means they lived in a way similar to plants, but they most probably lacked chlorophyll. Before animals could evolve, there had to be organic material, made by plants, that the animals could eat. The first animals probably did not differ much from the early plants. Even today, there are organisms that are midway between plants and animals. They belong to the flagellates, microscopic water living organisms that swim using long threads (flagellae). Many flagellates are true plants, living off the suns energy, carbon dioxide and water, while others eat other organisms, qualifying to be animals. But some flagellates can support themselves in both ways, both as plants and animals.
The sun is the energy source for almost all living organisms. Only the plants can use this source directly to make organic materials by the process called photosynthesis.
The plants take in: Solar energy, carbon dioxide from the air or water, water and salts in solution.
The plants exhale: Oxygen.
The plants produce: Carbohydrates, sugars, cellulose and other plant material, proteins, fat.
The photosynthesis, of which the green plants are the only ones able to perform, produce all the organic material that plants and animals need to live and grow. It is the foundation for all life on Earth. The green plants on land and in the Ocean, each year produce about 100 000 million tons organic material. Fossil energy (coal and petroleum) is the result of this organic material accumulated in the sediments. List of contents in the fossil plants showcase
Publisert 18. mai 2011 16:00 - Sist endret 13. mai 2019 13:56