By Michael Anderson
Existence is available in all shapes and types, and dwelling entities live in every kind of habitats. There are seven features that every one existence types sharethe skill to maneuver, to experience, to breathe, to eat meals, to develop, to breed, and to excrete waste topic. entire with annotated illustrations that make clear complicated constructions and lifestyles techniques, this quantity surveys the elements, features, and classifications of assorted dwelling issues and explores the evolution of lifestyles in most cases.
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Additional resources for A Closer Look at Living Things (Introduction to Biology)
For example, the same streamlined shape for high-speed motion in seawater evolved independently at least four times: in prehistoric reptiles; in tuna, which are fish; and in dolphins and seals, which are mammals. 50 evolution And the history of life on eArth Life on Other Planets? No one knows if extraterrestrial life, or life that originated beyond Earth, exists or ever existed. The branch of biology concerned with extraterrestrial life, from microscopic organisms to intelligent beings, is called exobiology or astrobiology.
For centuries scientists divided living things into two kingdoms— plants and animals. Most organisms classified in the plant kingdom had chlorophyll and cellulose. The animal kingdom consisted of species that lacked chlorophyll or cellulose. This classification system was formalized in the 18th century by the biologist Carolus Linnaeus. The system of Linnaeus was based on similarities in body structure, and it was completed more than a hundred years before the work of Charles Darwin, whose theory of evolution showed that the similarities and differences of organisms could be viewed as a product of evolution by natural selection.
43 A Closer look At living things A drop of sap drips from a tree. Sap transports necessary nutrients to the tree’s many cells and helps rid plant life of waste products. free_ spirit@photos/Flickr/Getty Images The larger multicellular animals provide for the needs of their cells with circulating liquids called blood and lymph. Blood carries oxygen and nutrients from digested food to the body’s cells, and it carries away the carbon dioxide and water produced as wastes by cellular processes. Lymph is a fluid that circulates through its own system in the body, playing an important role in the immune system as well as helping the blood dispose of wastes from tissues.