Biology : The kingdoms of life |
Animal kingdomAnimals are considered the most complex organisms on Earth. They are multi-celled organisms, eat food for survival, and have nervous systems. They are divided into vertebrates and invertebrates and include mammals, amphibians, reptiles, birds and fish. see our posting on Respiration Protist kingdomProtists are mostly single-celled organisms. They have a nucleus and usually live in water. Some protists move around, while others stay in one place. Examples of creatures in this kingdom include some algae, amoeba and paramecium. Fungi kingdomFungi are usually motionless organisms that absorb nutrients for survival. Examples of these creatures include mushrooms, molds, and yeasts. Monera kingdomMonera are also single-celled organisms but they do not have a nucleus. Bacteria make up the entire kingdom. According to scientists, there are more forms of bacteria than any other organism on planet earth, some of which are beneficial to humans, such as the ones found in yogurt while others can cause illness in humans. Plant kingdomPlants contain chlorophyll, a green pigment necessary for photosynthesis, a process by which plants convert energy from sunlight into food. Their cell walls are made sturdy by a material called cellulose. Plants are further divided into two groups: flower and fruit-producing plants and those that don’t produce flowers or fruits. |
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