By Michael Anderson

ISBN-10: 1615305831

ISBN-13: 9781615305834

Lifestyles is available in all shapes and types, and dwelling entities live in all kinds of habitats. There are seven features that each one lifestyles varieties sharethe skill to maneuver, to feel, to breathe, to devour foodstuff, to develop, to breed, and to excrete waste subject. whole with annotated illustrations that make clear complicated buildings and existence methods, this quantity surveys the components, features, and classifications of assorted residing issues and explores the evolution of existence as a rule.

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Human beings—like most other animals, fungi, protists, and bacteria—are heterotrophs. How Algae and Plants Obtain Food All living things either make their food or get it ready-made. The single-celled alga Protococcus uses both methods. It uses photosynthesis to manufacture food from water and carbon dioxide. The process requires energy, which it obtains from sunlight. After several steps the food-making process results in a kind of sugar called glucose. This sugar is 37 A Closer look At living things An oak tree covered by a thin, green layer of Protococcus.

Three other commonly found elements, oxygen, hydrogen, and nitrogen, are also important in the structure and function of living things. In the human body, for example, these elements, together with carbon, make up about 96 percent of the body’s weight. Oxygen and hydrogen are highly important in body processes that obtain and use energy 33 A Closer look At living things The elements oxygen and hydrogen help the human body absorb and process important nutrients found in food and water. com 34 Cells, tissues, And orgAns from food.

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. Scientists in this field consider the conditions necessary for life, how it evolves, how to detect alien life-forms, and the environments in which they might live, whether in our own solar system or on any of the numerous planets orbiting other stars.

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A Closer Look at Living Things (Introduction to Biology) by Michael Anderson

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