What is the key role of the bacteria in the environment?
Bacteria are single-celled organisms which contribute more biomass than all animals and plants put together. They have a key role in nutrient cycles and have importance biotechnology and have various pathogenic types and they have no true nucleus.
Eukaryota has the shares cellular features of a nucleus and membrane-covered organelles. There are over 2 million known species of Eukaryota. The multi-cellular forms of life are found in this domain, and some single-celled as well. Familiar kingdoms are plants, fungi, and animals and of the three the plant kingdom is the least closely related.
From the three domains, the Eukaryota is then split into two kingdoms called animals and plants. Each of these is then split into different phyla.
In the plant phyla it includes:
- Mosses- flowerless plants which lack seeds and vascular systems.
- Liverworts- flowerless, spore-producing plants with flattened stems and overlapping leaves.
- Ferns- flowerless plants that reproduce by producing spores and which have a vascular system.
- Gymnosperms- flowerless plants that produce seeds for reproduction and which have a vascular system, e.g. the conifer.
- Angiosperms- flowering plants, e.g. Arabidopsis thaliana.