Humans belong to the domain Eukaryota. This domain includes four of the six kingdoms of life: Protista, Fungi, Plantae and Animalia. The other two domains are Archaea and Bacteria.Know More
The domain Eukaryota includes all organisms that have membrane-bound structures called organelles, which include the nucleus, mitochondria and chloroplasts. The most diverse group in Eukaryota is the protist kingdom. Some scientists do not think that the protists should be lumped together in one kingdom.
The other two domains contain organisms that do not have organelles. These organisms are called prokaryotes and consists of bacteria. While the domain Bacteria consists of the common bacteria with which humans often come into contact, the domain Archaea contains the bacteria not often encountered, such as the organisms living in extreme environments, including those thriving in the deep sea vents or salty lakes.Learn More
A community of organisms and their nonliving environment is called an ecosystem. In addition to living organisms, the primary components of an ecosystem are soil, atmosphere, heat and light from the sun, and water.Full Answer >
The work of Thomas Malthus was studied by Charles Darwin. Malthus, an English scholar and social economist, observed that high population growth is controlled by such natural catastrophes as famine and disease. Darwin applied this observation to animal populations and formulated his theory of natural selection.Full Answer >
The process that uses oxygen in plants, algae and animals is cellular respiration. In this process, oxygen is used to decompose glucose into energy that is used for energy, growth and other metabolic processes. Aside from energy, this process also results in the creation of carbon dioxide and water.Full Answer >
The C4 pathway is a method plants use to convert atmospheric carbon dioxide into a chemical compound containing four carbons. About.com explains that plans that utilize this pathway usually originate in subtropical areas. Examples include maize, sugarcane, sorghum, millet and papyrus. These plants commonly grow at latitudes below 45 degrees, in the tropics.Full Answer >