The biosphere is composed of the parts of Earth where life exists. It includes the dark environment of the ocean's deep trenches, the rainforests and high mountaintops. Bacteria, protozoa and up to 30 million species of animals, plants and fungi are included in the biosphere.Know More
Although the biosphere is a life-supporting global ecosystem, it comprises a relatively thin part of Earth's surface. The biosphere measures approximately 12 miles from top to bottom, but almost all life exists between 1,640 feet below the ocean's surface to 3.75 miles above sea level.
Some ancient prokaryotes developed a way to convert carbon dioxide and water to make simple sugars. Over time, these photosynthetic organisms helped change the biosphere so that new forms of life could exist. The biosphere has existed for 3.5 billion years and is a large ecosystem comprised of many smaller ecosystems.
The biosphere is characterized by the continuous cycling of matter, and water is a major factor. The flow of solar energy helps maintain the structure of organisms, and the elements carbon, hydrogen, nitrogen, oxygen and sulfur combine with proteins, lipids and nucleic acids to form the building blocks of life. Biosphere reserves exist to help people establish and maintain a balanced relationship with the natural world.Learn more about Biology
Multicellular organisms are composed of more than one cell, while unicellular organisms are a single living cell. This difference determines the size and complexity of an organism, as well as the division of labor within it. Each kind of organism has its own set of survival benefits.Full Answer >
Life processes are the series of actions that are essential to determine if an animal is alive. Living things have seven essential processes in common: movement, respiration, sensitivity, growth, reproduction, excretion and nutrition. All things fall into one of three categories: living, used to be living or not living; the presence of all seven life processes indicates a living thing.Full Answer >
Whether plant or animal, life begins with the cell. Single-celled animals, such as the amoeba, have all they need to survive contained within one flexible cell membrane. More complex plants and animals have several different types of cells organized into groups to perform certain functions.Full Answer >
Plants use a process called photosynthesis to convert light energy from the sun into sugar energy in the presence of carbon dioxide and water. This process takes place in organelles called chloroplasts, which are found in abundance in the leaves of the plant.Full Answer >